Intervention targeting development of socially synchronous engagement in toddlers with autism spectrum disorder: a randomized controlled trial
Open accessAbstract
Background: Social and communication impairments are core deficits and prognostic indicators of autism. We evaluated the impact of supplementing a comprehensive intervention with a curriculum targeting socially synchronous behavior on social outcomes of toddlers with autism spectrum disorders (ASD). Methods: Fifty toddlers with ASD, ages 21 to 33 months, were randomized to one of two six‐month interventions: Interpersonal Synchrony or Non‐Interpersonal Synchrony. The interventions provided identical intensity (10 hours per week in classroom), student‐to‐teacher ratio, schedule, home‐based parent training (1.5 hours per month), parent education (38 hours), and instructional strategies, except the Interpersonal Synchrony condition provided a supplementary curriculum targeting socially engaged imitation, joint attention, and affect sharing; measures of these were primary outcomes. Assessments were conducted pre‐intervention, immediately post‐intervention, and, to assess maintenance, at six‐month follow‐up. Random effects models were used to examine differences between groups over time. Secondary analyses examined gains in expressive language and nonverbal cognition, and time effects during the intervention and follow‐up periods. Results: A significant treatment effect was found for socially engaged imitation ( p = .02), with more than doubling (17% to 42%) of imitated acts paired with eye contact in the Interpersonal Synchrony group after the intervention. This skill was generalized to unfamiliar contexts and maintained through follow‐up. Similar gains were observed for initiation of joint attention and shared positive affect, but between‐group differences did not reach statistical significance. A significant time effect was found for all outcomes ( p < .001); greatest change occurred during the intervention period, particularly in the Interpersonal Synchrony group. Conclusions: This is the first ASD randomized trial involving toddlers to identify an active ingredient for enhancing socially engaged imitation. Adding social engagement targets to intervention improves short‐term outcome at no additional cost to the intervention. The social, language, and cognitive gains in our participants provide evidence for plasticity of these developmental systems in toddlers with ASD. http://www.clinicaltrials.gov/ct2/show/NCT00106210?term = landa&rank = 3.
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- Findingown data
At post-test, there was a trend toward more frequent initiation of joint attention in the Interpersonal Synchrony group (p=.08, d=0.89).
“Between-group comparisons of IJA and SPA at post-test and follow-up revealed a trend toward significance for more frequent IJA at post-test (p=.08, d=0.89) and follow-up (p=.07, d=1.56) in the IS group.”
Quote in the paperNot a substantial claim - Findingown data
The Non-IS group showed significant growth over time only on the expressive language T score.
“while the Non-IS group showed significant growth only on the EL T score (p=0.01).”
Quote in the paperNot a substantial claim - Findingown data
IJA showed a trend toward significance at both post-test and follow-up.
“with a trend toward significance for IJA at post-test and follow-up.”
Quote in the paperSubstantial claim - Findingown data
The rate of growth in socially engaged imitation differed between groups during the intervention period (p=0.04).
“Analysis of between-group differences in slopes (rates of growth) within each assessment period revealed differences in SEI growth during the intervention period (p=0.04; Table 3) but not during follow-up (p=0.24).”
Quote in the paperSubstantial claim - Findingown data
For all outcomes except SPA, the IS group had significantly more rapid growth in the intervention period than in the follow-up period.
“For all outcomes except for SPA (p=0.07), the IS group had significantly more rapid growth in the intervention period than in the follow-up period (p’s ≤0.001).”
Quote in the paperSubstantial claim
- Findingown data
The IS group showed greater growth during the intervention period on visual reception T score.
“a result of greater growth during the intervention period for the IS group (p=0.02; Table 3).”
Quote in the paperNot a substantial claim - Findingown data
At follow-up, there was a trend toward more frequent initiation of joint attention in the Interpersonal Synchrony group (p=.07, d=1.56).
“Between-group comparisons of IJA and SPA at post-test and follow-up revealed a trend toward significance for more frequent IJA at post-test (p=.08, d=0.89) and follow-up (p=.07, d=1.56) in the IS group.”
Quote in the paperNot a substantial claim - Findingown data
The joint test found no overall between-group difference on visual reception T scores.
“Joint tests of differences did not reveal overall between-group differences on EL or VR T scores (chi-square=2.71, df=3, p=0.44 for EL; chi-square=5.24, df=3, p=0.16 for VR)”
Quote in the paperNot a substantial claim - Findingown data
Significant time effects were found for the full sample on all variables.
“Significant time effects were found for the full sample for all variables (p’s=0.00 to 0.01; Table 2)”
Quote in the paperNot a substantial claim - Findingown data
The joint test found no overall between-group difference on expressive language T scores.
“Joint tests of differences did not reveal overall between-group differences on EL or VR T scores (chi-square=2.71, df=3, p=0.44 for EL; chi-square=5.24, df=3, p=0.16 for VR)”
Quote in the paperNot a substantial claim - Findingown data
The rate of growth in socially engaged imitation did not differ between groups during follow-up (p=0.24).
“Analysis of between-group differences in slopes (rates of growth) within each assessment period revealed differences in SEI growth during the intervention period (p=0.04; Table 3) but not during follow-up (p=0.24).”
Quote in the paperNot a substantial claim - Findingown data
At follow-up, the Interpersonal Synchrony group performed significantly more socially engaged imitation than the Non-Interpersonal Synchrony group (p=0.01, d=0.86).
“Subsequent between-group comparisons at post-test and follow-up revealed significantly more SEI performed by the IS than Non-IS group at follow-up (p=0.01; d=0.86).”
Quote in the paperSubstantial claim - Findingown data
SEI showed significant treatment effects at follow-up.
“Significant treatment effects were found for SEI at follow-up”
Quote in the paperSubstantial claim - Findingown data
The IS group showed significant growth over time on every outcome.
“The IS group showed significant growth over time on every outcome (p’s<0.01)”
Quote in the paperSubstantial claim - Findingown data
There was no statistically significant overall main effect of intervention group on shared positive affect (chi-square=2.61, df=3, p=0.46).
“A statistically significant overall main effect was found for SEI (chi-square 9.98, df=3, p=0.02; Table 2), but not for IJA (chi-square=365, df=3, p=0.30) or SPA (chi-square=2.61, df=3, p=0.46).”
Quote in the paperNot a substantial claim - Findingown data
Effect sizes for expressive language and visual reception were moderate at post-test and follow-up.
“despite moderate effect sizes at post-test of 0.57 and 0.49, respectively, and at follow-up of 0.46 and 057, respectively (Table 2).”
Quote in the paperNot a substantial claim - Findingown data
There was a significant time effect for all outcomes (p<0.001).
“A significant time effect was found for all outcomes (p<0.001); greatest change occurred during the intervention period, particularly in the Interpersonal Synchrony group.”
Quote in the paperNot a substantial claim - Findingown data
There was a statistically significant overall main effect of intervention group on socially engaged imitation (chi-square=9.98, df=3, p=0.02).
“A statistically significant overall main effect was found for SEI (chi-square 9.98, df=3, p=0.02; Table 2), but not for IJA (chi-square=365, df=3, p=0.30) or SPA (chi-square=2.61, df=3, p=0.46).”
Quote in the paperSubstantial claim - Findingown data
There was no statistically significant overall main effect of intervention group on initiation of joint attention (chi-square=365, df=3, p=0.30).
“A statistically significant overall main effect was found for SEI (chi-square 9.98, df=3, p=0.02; Table 2), but not for IJA (chi-square=365, df=3, p=0.30) or SPA (chi-square=2.61, df=3, p=0.46).”
Quote in the paperSubstantial claim - Findingown data
Development progressed fastest during the 6-month active intervention phase.
“First, the most rapid growth in development occurred during the 6-month active intervention period.”
Quote in the paperSubstantial claim - Findingown data
Toddlers with ASD show improvement in socially engaged imitation when given a targeted curriculum and related activities.
“Our findings indicate that toddlers with ASD improve in socially engaged imitation in response to a targeted curriculum and intervention activities.”
Quote in the paperSubstantial claim - Premisecitation
Many behavioral interventions are linked to improvements in cognitive, behavioral, and language impairments in children with ASD.
“Yet many behaviorally-based interventions are associated with improvement in cognitive, behavioral, and language impairments for children with ASD (Rogers & Vismara, 2008), suggesting plasticity in these aspects of development, particularly when intervention is begun early (Drew et al., 2002; Harris & Handelman, 2000).”
Quote in the paperSubstantial claim0 of 1 sources checked- cites Rogers & Vismara, 2008
Not checked in the free run.
- Interpretationreasoning
Young children with ASD who produce only infrequent and brief periods of engagement with others have fewer opportunities for language and social learning.
“Thus, young children with ASD who elicit only infrequent, brief epochs of engagement with others limit opportunities for language and social learning.”
Quote in the paperSubstantial claim - Premisecitation
Drew and colleagues found no social gains on a parent interview measure after about one year of intervention in two groups of nearly two-year-olds receiving parent training plus local services or local services only.
“Drew and colleagues (2002) found no social gains after about one year of intervention on a parent interview measure in two groups of nearly 2-year-olds enrolled in a parent training (plus local services) or a local services only group (Drew et al., 2002).”
Quote in the paperNot a substantial claim0 of 1 sources checked- cites Drew et al., 2002
Not checked in the free run.
- Premisecitation
ASD can be reliably diagnosed in children around two years of age.
“Despite evidence that ASD can be diagnosed reliably in two-year olds (Chawarska, Klin, Paul, & Volkmar, 2007), only a few intervention studies, mostly with small sample sizes, have been published involving this age group, and most have relied on descriptive or quasi-experimental approaches.”
Quote in the paperSubstantial claim0 of 1 sources checked- cites Chawarska, Klin, Paul, & Volkmar, 2007
Not checked in the free run.
- Premisenone given
Only three peer-reviewed intervention studies have reported social improvements in two-year-olds with ASD.
“only three peer-reviewed intervention studies identified social improvements in 2-year-olds with ASD.”
Quote in the paperSubstantial claim0 of 3 sources checked- cites Stahmer, Ingersoll, and Koegel (2004)
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- cites Chandler, Christie, Newson, and Prevezer (2002)
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- cites Schertz and Odom (2007)
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- Interpretationreasoning
These impairments emerge early in typical development and provide a weak basis for establishing and maintaining synchronous, reciprocal engagement with others.
“These impairments, which emerge early in typical development, form a weak foundation for the ability to establish and maintain synchronous, reciprocal engagement with others.”
Quote in the paperNot a substantial claim - Study design and conductown data
Fifty two-year-olds with ASD were randomly assigned to one of two intervention conditions.
“Fifty two-year-olds diagnosed with ASD were randomized to one of the two intervention conditions.”
Quote in the paperSubstantial claim - Interpretationown data
Community-based interventions likely did not adequately target social development.
“suggests the need for ongoing intervention targeting social development, and possibly that the community-based interventions did not sufficiently address these aspects of development.”
Quote in the paperSubstantial claim - Premisecitation
Both of the cited RCTs reported gains in expressive language.
“This possibility is supported by reports of expressive language gains in both RCTs cited above (Dawson et al., 2009; Drew et al., 2002)”
Quote in the paperSubstantial claim0 of 2 sources checked- cites Dawson et al., 2009
Not checked in the free run.
- cites Drew et al., 2002
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- Interpretationown data
The moderate effect sizes for SEI and IJA offer initial support for the intervention's efficacy.
“Moderate effect sizes for SEI and IJA provide preliminary evidence for the efficacy of this intervention where a supplementary curriculum for social initiation and socially synchronized engagement in toddlers is overlaid on an existing group-based comprehensive intervention.”
Quote in the paperSubstantial claim - Interpretationown data
The gain in socially engaged imitation carried over to different people, places, and interaction contexts.
“that generalized across people, location, and interaction context.”
Quote in the paperSubstantial claim - Study design and conductown data
Interpersonal Synchrony interventionists delivered significantly more IS instruction than Non-Interpersonal Synchrony interventionists.
“Significantly more IS instruction was provided by IS than Non-IS interventionists (p’s=0.047 to <0.001).”
Quote in the paperSubstantial claim - Study design and conductown data
Inter-rater reliability for initiation of joint attention and shared positive affect, based on 20% of videotaped sessions, was high (ICCs 0.952 and 0.999).
“ICCs for frequency of IJA and SPA calculated on 20% (n=28) of videotaped sessions were 0.952 and 0.999, respectively.”
Quote in the paperSubstantial claim - Interpretationown data
The social, language, and cognitive gains observed in the participants provide evidence that these developmental systems are plastic in toddlers with ASD.
“The social, language, and cognitive gains in our participants provide evidence for plasticity of these developmental systems in toddlers with ASD.”
Quote in the paperSubstantial claim - Interpretationown data
This study is the first to show a treatment response that includes improved integration of imitation with socially directed gaze.
“While others have reported improvements in imitation performance following targeted instruction (Ingersoll & Schreibman, 2006), this is the first study to identify a targeted treatment response involving gains in the integration of imitation with socially directed gaze.”
Quote in the paperSubstantial claim0 of 1 sources checked- cites Ingersoll & Schreibman, 2006
Not checked in the free run.
- Rests on an assumption: This trial is the first randomized controlled trial in two-year-olds with ASD to test an intervention component aimed at core social deficits.
- Study design and conductown data
All originally assigned participants were analyzed except one child in the Non-Interpersonal Synchrony group who was missing a pre-intervention initiation of joint attention value.
“We analyzed data from all individuals originally assigned to an intervention group, with the exception of one child in the Non-IS group who was missing a pre-intervention IJA value.”
Quote in the paperSubstantial claim - Premisecitation
Dawson and colleagues reported modest gains in nonverbal cognition.
“and of modest gains in nonverbal cognition reported by Dawson and colleagues (2009).”
Quote in the paperSubstantial claim0 of 1 sources checked- cites Dawson et al., 2009
Not checked in the free run.
- Interpretationreasoning
The lack of stronger between-group differences probably stems from how similar the two interventions were.
“The absence of more robust between-group differences is likely attributable to the similarity between the rival interventions.”
Quote in the paperSubstantial claim- Rests on an assumption: The AEPS curriculum also covers imitation and joint attention goals, though less thoroughly than the IS curriculum.
- Premisecitation
Kasari et al. (2008) found that preschoolers with ASD improved in joint attention whether their instruction targeted symbolic play or joint attention.
“Indeed, Kasari et al. (2008) reported significant gains in joint attention behavior in preschoolers with ASD regardless of whether they received instruction focused on symbolic play or joint attention.”
Quote in the paperSubstantial claim0 of 1 sources checked- cites Kasari et al. (2008)
Not checked in the free run.
- Study design and conductown data
The two intervention conditions were identical in intensity, student-to-teacher ratio, schedule, home-based parent training, parent education, and instructional strategies, except that the Interpersonal Synchrony condition included a supplementary curriculum targeting socially engaged imitation, joint attention, and affect sharing.
“The interventions provided identical intensity (10 hours per week in classroom), student-to-teacher ratio, schedule, home-based parent training (1.5 hours per month), parent education (38 hours), and instructional strategies, except the Interpersonal Synchrony condition provided a supplementary curriculum targeting socially engaged imitation, joint attention, and affect sharing; measures of these”
Quote in the paperSubstantial claim - Interpretationreasoning
This is the first randomized trial in toddlers with ASD to identify an active ingredient for improving socially engaged imitation.
“This is the first ASD randomized trial involving toddlers to identify an active ingredient for enhancing socially engaged imitation.”
Quote in the paperSubstantial claim - Study design and conductown data
Outside speech-language treatment hours were not correlated with pre- to post-test change in MSEL Receptive or Expressive Language T scores.
“There was no correlation between number of hours of outside speech-language treatment and change in MSEL Receptive or Expressive Language T score from pre- to post-test (r=−0.233, r=−0.236, respectively).”
Quote in the paperNot a substantial claim - Interpretationreasoning
The strong child-other engagement in both interventions' naturalistic settings might have been enough to boost affect sharing and joint attention without extra instruction on those skills.
“The high level of child-other engagement within the ecologically valid learning contexts of both interventions may have been sufficient to activate a high level of affect sharing and joint attention even without the additional infusion of instruction targeting joint attention and affect sharing.”
Quote in the paperSubstantial claim- Rests on an assumption: The AEPS curriculum also covers imitation and joint attention goals, though less thoroughly than the IS curriculum.
- Interpretationown data
The full sample showed improving performance over time.
“indicating improving performance over time.”
Quote in the paperNot a substantial claim - Interpretationreasoning
Early intervention directly targeting socially engaged imitation, joint attention, and affect sharing could have strong effects on later language, play, and social outcomes.
“Thus, early intervention that directly targets the development of socially engaged imitation, joint attention and affect sharing could have potent effects on later language, play and social outcomes (Bono, Daley, & Sigman, 2004; Sigman & Ruskin, 1999; Toth, Munson, Meltzoff, & Dawson, 2006).”
Quote in the paperSubstantial claim0 of 3 sources checked- cites Bono, Daley, & Sigman, 2004
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- cites Sigman & Ruskin, 1999
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- cites Toth, Munson, Meltzoff, & Dawson, 2006
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- Study design and conductown data
Because there was no assess-and-monitor control group, the study cannot conclude that the shared intervention program caused the gains.
“Since we did not include an “assess and monitor” control group, we cannot conclusively infer that these gains were effected by the overall intervention program common to both groups.”
Quote in the paperSubstantial claim - Premisecitation
Early social development strongly predicts later outcomes for children with ASD.
“and given that early social development is a major predictor of outcome for children with ASD (Charman et al., 2003; Sigman & Ruskin, 1999)”
Quote in the paperSubstantial claim0 of 2 sources checked- cites Charman et al., 2003
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- cites Sigman & Ruskin, 1999
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- Interpretationreasoning
The effect came from adding a supplementary social curriculum to an intervention that already used a defined developmental curriculum and evidence-based teaching strategies.
“This effect was obtained by layering a supplementary social curriculum onto an intervention that utilized a well-defined developmental curriculum and integrated several evidence-based instructional strategies.”
Quote in the paperSubstantial claim - Premisecitation
Most young children with ASD have widespread deficits in imitation, joint attention, and affect sharing.
“Given the pervasive nature of imitation, joint attention and affect sharing deficits in most young children with ASD (Kasari, Freeman, & Paparella, 2006; Landa et al., 2007; Sullivan et al., 2007)”
Quote in the paperSubstantial claim0 of 3 sources checked- cites Kasari, Freeman, & Paparella, 2006
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- cites Landa et al., 2007
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- cites Sullivan et al., 2007
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- Interpretationreasoning
This added benefit came without additional cost.
“Thus, an incremental benefit was achieved at no extra cost.”
Quote in the paperNot a substantial claim - Interpretationcitation
These developmental domains might be especially malleable and responsive to early intervention.
“these aspects of development may be particularly plastic and responsive to early intervention.”
Quote in the paperNot a substantial claim - Interpretationreasoning
The IS group retained the skills it had gained during intervention.
“It also indicates that the IS group did not lose the skills acquired during the intervention.”
Quote in the paperSubstantial claim - Interpretationown data
This is the first randomized trial to show that a developmental social curriculum is an active ingredient for improving socially engaged imitation in toddlers with ASD.
“This is the first RCT to identify a developmental social curriculum as an active ingredient for improving socially engaged imitation in toddlers with ASD.”
Quote in the paperSubstantial claim- Rests on an assumption: This trial is the first randomized controlled trial in two-year-olds with ASD to test an intervention component aimed at core social deficits.
- Interpretationown data
Our data suggest these gains can occur in a fairly short time.
“Furthermore, our data indicate that such gains may be effected in a relatively brief period of time.”
Quote in the paperNot a substantial claim - Interpretationcitation
Results from Dawson et al. and our study suggest that toddlers with ASD can make large gains in early intervention that uses responsive teaching and a developmental curriculum.
“Although Dawson and colleagues did not include social variables comparable to those reported herein, the expressive language and nonverbal cognition results from their study and ours indicate that toddlers with ASD are able to make substantial gains in early intervention using well-defined responsive instructional strategies and developmentally-based curriculum.”
Quote in the paperSubstantial claim0 of 1 sources checked- cites Dawson and colleagues’ (2009)
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- May combine two claims. 35
- Classified as probably not a substantial claim. 16
May combine two claims.
Findingown dataThe added curriculum stimulated socially engaged imitation, which more than doubled from pre-test to post-test.
“The supplementary curriculum activated development of socially engaged imitation (a greater than two-fold increase from pre- to post-test)”
Quote in the paperSubstantial claimMay combine two claims.
Findingown dataThere was a significant treatment effect on socially engaged imitation (p=0.02), with the proportion of imitated acts paired with eye contact in the Interpersonal Synchrony group increasing from 17% to 42% after intervention.
“A significant treatment effect was found for socially engaged imitation (p=0.02), with more than doubling (17% to 42%) of imitated acts paired with eye contact in the Interpersonal Synchrony group after the intervention.”
Quote in the paperSubstantial claimMay combine two claims.
Findingown dataA marginal treatment effect was found for visual reception T score, with a trend toward higher nonverbal cognition at post-test for the IS group.
“A marginal treatment effect was found for VR T score, with a trend toward higher levels of nonverbal cognition at post-test for the IS group (p=0.07; Table 2)”
Quote in the paperNot a substantial claimProbably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.
Findingown dataNonverbal cognition improved more in the IS group during intervention, with a trend toward significance.
“A trend toward significance was found for greater improvement in the secondary variable of nonverbal cognition within the IS group during the intervention period.”
Quote in the paperNot a substantial claimMay combine two claims.
Findingown dataThe greatest change occurred during the intervention period, particularly in the Interpersonal Synchrony group.
“A significant time effect was found for all outcomes (p<0.001); greatest change occurred during the intervention period, particularly in the Interpersonal Synchrony group.”
Quote in the paperNot a substantial claimMay combine two claims.
Findingown dataThe improvement in socially engaged imitation generalized to unfamiliar contexts and was maintained through follow-up.
“This skill was generalized to unfamiliar contexts and maintained through follow-up.”
Quote in the paperSubstantial claimMay combine two claims.
Findingown dataEffect sizes for the IS group's growth during the follow-up period ranged from −0.34 for visual reception T score to 0.34 for IJA, with none statistically significant.
“In contrast, effect sizes for the IS group’s growth during the follow-up period, while not receiving our intervention, ranged from −0.34 for VR T score to 0.34 for IJA, with none being statistically significant.”
Quote in the paperSubstantial claimMay combine two claims.
Findingown dataDuring follow-up, growth slowed in the IS group and declined in the Non-IS group.
“Our finding that slopes became less steep in the IS group or decreased in the Non-IS group during follow-up”
Quote in the paperSubstantial claimMay combine two claims.
Findingown dataGains similar to those in socially engaged imitation were observed for initiation of joint attention and shared positive affect, but the between-group differences were not statistically significant.
“Similar gains were observed for initiation of joint attention and shared positive affect, but between-group differences did not reach statistical significance.”
Quote in the paperNot a substantial claimMay combine two claims.
Findingown dataThe effect sizes for the IS group's growth during the intervention period were all over 1 and all reached significance.
“The effect sizes for the IS group’s growth during the intervention period were all over 1 and all reached significance (p<0.001).”
Quote in the paperNot a substantial claimMay combine two claims.
Findingown dataBoth groups showed gains in social, cognitive, and language domains, especially during the 6-month intervention and in the IS group.
“Secondary analyses also revealed social, cognitive, and language gains in both groups, particularly during the 6-month intervention period and within the IS group.”
Quote in the paperNot a substantial claimMay combine two claims.
Findingown dataThe Non-IS group showed significant growth during the intervention period only for expressive language T score, with no significant growth during follow-up.
“The Non-IS group showed significant growth during the intervention period only for EL T score (p=0.02), with no significant growth detected on any variable during follow-up.”
Quote in the paperNot a substantial claimMay combine two claims.
Findingown dataBoth intervention groups made significant gains in expressive language, cognitive, and social functioning.
“Significant improvements in expressive language, cognitive, and social functioning occurred in both intervention groups.”
Quote in the paperSubstantial claimMay combine two claims.
PremisecitationSocial and communication impairments are central deficits and predictors of outcome in autism spectrum disorders.
“Social and communication impairments are core deficits and prognostic indicators of autism.”
- Also stated in: § Conclusions · plain
“Autism spectrum disorders (ASDs) are defined by the presence of social and communication impairments that appear early in life and persist into adulthood (Howlin, Goode, Hutton, & Rutter, 2004; Landa, Holman, & Garrett-Mayer, 2007).”
Quote in the paperSubstantial claim0 of 2 sources checked- cites Howlin, Goode, Hutton, & Rutter, 2004
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- cites Landa, Holman, & Garrett-Mayer, 2007
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- Also stated in: § Conclusions · plain
May combine two claims.
PremisecitationDawson and colleagues reported a negative change in Vineland Socialization standard scores and no improvement in ADOS severity scores after two years of intervention in 23-month-olds receiving either the Early Denver Model or local services.
“Dawson and colleagues (2009) reported a negative change in Vineland Adaptive Behavior Scales Socialization domain standard score (Sparrow, Balla, & Cicchetti, 1984) and lack of improvement in severity scores from the Autism Diagnostic Observation Schedule (ADOS; Lord, Rutter, DiLavore, & Risi, 1999) after two years of intervention in 23-month-olds receiving either the Early Denver Model (20 hours”
Quote in the paperSubstantial claim0 of 3 sources checked- cites Dawson et al., 2009
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- cites Sparrow, Balla, & Cicchetti, 1984
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- cites Lord, Rutter, DiLavore, & Risi, 1999
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May combine two claims.
PremisecitationA parent-mediated intervention study by Chandler and colleagues reported improved social interest in all 18 participants, but did not provide details on the magnitude or measurement of change.
“In their description of a parent-mediated intervention for young children with ASD, Chandler, Christie, Newson, and Prevezer (2002) reported improved social interest in all 18 participants, but details were not provided about the magnitude of change nor how it was measured.”
Quote in the paperNot a substantial claim0 of 1 sources checked- cites Chandler, Christie, Newson, and Prevezer (2002)
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May combine two claims.
Premisenone givenFew intervention studies involving two-year-olds with ASD have been published, and most used descriptive or quasi-experimental designs with small samples.
“only a few intervention studies, mostly with small sample sizes, have been published involving this age group, and most have relied on descriptive or quasi-experimental approaches.”
Quote in the paperSubstantial claimMay combine two claims.
PremisecitationThe social and communication impairments that differentiate ASD from typical development and developmental delay include abnormalities in affect expression, communication initiation, reciprocity, social/affective signaling, joint attention, symbolic behavior, motor imitation, language comprehension, and conventional gesture use.
“Social and communication impairments that distinguish ASD from typical development and developmental delay include abnormality in affect expression, initiation of communication, reciprocity in interaction, social/affective signaling, joint attention, symbolic behavior, motor imitation, language understanding, and conventional use of gestures (Charman et al., 1997; Landa, Holman, & Garrett-Mayer, 2”
Quote in the paperSubstantial claim0 of 3 sources checked- cites Charman et al., 1997
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- cites Landa, Holman, & Garrett-Mayer, 2007
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- cites Rogers, Hepburn, Stackhouse, & Wehner, 2003
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May combine two claims.
PremisecitationIn a descriptive study of 20 two-year-olds, Stahmer and colleagues found improvements in some children's tolerance of peer proximity, responses to others' initiations, and reciprocal interaction after an average of 9.7 months of intervention.
“In their descriptive study of 20 2-year-olds enrolled in a classroom-based, multi-instructional method intervention, Stahmer, Ingersoll, and Koegel (2004) identified improvements in some children’s tolerance of proximity to peers, response to others’ initiations, and engagement in reciprocal interaction after a mean of 9.7 months of intervention.”
Quote in the paperSubstantial claim0 of 1 sources checked- cites Stahmer, Ingersoll, and Koegel (2004)
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Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.
PremisecitationSchertz and Odom reported improvement in two of three children's responses to others' joint attention bids and in their initiation of joint attention.
“In another parent-mediated intervention, Schertz and Odom (2007) reported improvement in two of three children’s response to others’ joint attention bids and initiation of joint attention.”
Quote in the paperNot a substantial claim0 of 1 sources checked- cites Schertz and Odom (2007)
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May combine two claims.
Study design and conductown dataThere were no between-group differences on any dependent variable at pre-test, indicating well-matched groups.
“T-tests and chi-square tests revealed no between-group differences on any of the dependent variables at pre-test (p’s=0.239 to 0.924), indicating well-matched groups (see Table 1).”
Quote in the paperSubstantial claimProbably not a substantial claim: may not pass S3 (load-bearing).
Interpretationown dataThe non-significant overall test for initiation of joint attention may be related to the significantly greater variance within the Interpersonal Synchrony group at follow-up (p<0.001).
“Lack of significance on the joint test for IJA could be related to the significantly larger variance within the IS group for IJA at follow-up (p<0.001).”
Quote in the paperNot a substantial claimClassified as probably not a substantial claim.
Study design and conductown dataThe statistical model adjusted for pre-test outcome values, ADOS combined Communication and Social Interaction scores, and MSEL Receptive Language T scores.
“To account for chance differences between groups at pre-test and increase precision, the model also controlled for pre-test values of each outcome variable, ADOS algorithm combined Communication and Social Interaction scores (a measure of autism severity), and MSEL Receptive Language T scores.”
Quote in the paperSubstantial claimMay combine two claims.
InterpretationreasoningBeing able to combine imitation with socially directed gaze lets toddlers with ASD resemble peers and signal engagement.
“Such ability enables toddlers with ASD to liken themselves to peers while also signaling their interactive engagement.”
Quote in the paperSubstantial claimProbably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.
Study design and conductown dataInter-observer reliability for fidelity coding was assessed on 27% of coded videotapes, with ICCs from 0.79 to 0.97.
“Inter-observer reliability was assessed for 27% (n=17) of coded video tapes; intraclass correlation coefficients (ICC) ranged from 0.79 to 0.97.”
Quote in the paperNot a substantial claimProbably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.
Study design and conductown dataDiagnostic inter-rater reliability was assessed in 9 cases (18%), with 100% agreement.
“Inter-rater reliability of diagnosis was examined for 9 (18%) cases; agreement was 100%.”
Quote in the paperNot a substantial claimMay combine two claims.
Study design and conductreasoningThe assessment of SEI, IJA, and SPA was demanding and tested generalization to a new context, examiner, and activity.
“The test of SEI, IJA, and SPA outcome was stringent, reflecting generalization of these behaviors to a novel interaction context (location and materials), with an unfamiliar examiner, under unfamiliar circumstances (activity).”
Quote in the paperSubstantial claimClassified as probably not a substantial claim. May combine two claims.
Study design and conductown dataOutcome assessments at baseline, post-intervention, and six-month follow-up were conducted by a clinician who was blind to group assignment and unfamiliar with the child.
“Children were assessed at baseline (pre-test), termination of the intervention (post-test), and at a six-month follow-up within the Autism Center’s Child Development Laboratory by a clinician blind to group membership and unfamiliar to the child.”
Quote in the paperSubstantial claimMay combine two claims.
Study design and conductown dataThe final analyzed sample comprised 48 children, with 24 in the Interpersonal Synchrony group and 24 in the Non-Interpersonal Synchrony group.
“Analyses were conducted on a final sample of 48 children (IS n=24; Non-IS n=24).”
Quote in the paperSubstantial claimMay combine two claims.
Study design and conductreasoningThe two groups had similar treatments; the only difference was whether the supplementary social curriculum for SEI, IJA, and SPA was added.
“We compared change in self-initiated socially engaged behavior in two groups receiving comparable treatments, differing only in the presence or absence of a supplementary social curriculum targeting SEI, IJA, and SPA, which are core deficits of autism.”
Quote in the paperSubstantial claimMay combine two claims.
Study design and conductown dataSocially engaged imitation was coded blind to group and time from videotapes of a structured imitation task, with an ICC of 0.956 based on 15 videotapes.
“SEI was coded blind to group membership or time point from videotapes of a structured imitation task, modified from that described by Rogers and colleagues (2003). Examiners modeled 15 novel facial, manual, and object manipulation movements, providing two response opportunities per movement, as children were instructed to “Do this”. ICC calculated on 15 (12%) videotapes was 0.956.”
Quote in the paperSubstantial claim0 of 1 sources checked- cites Rogers and colleagues (2003)
Not checked in the free run.
Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.
Study design and conductown dataOne child was withdrawn by parents to enroll in a program for typically developing children, and one child was missing a primary baseline variable.
“One child was withdrawn by his parents to enroll in a program for children with typical development and one child was missing a primary baseline variable (Figure 1).”
Quote in the paperNot a substantial claimProbably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.
Study design and conductnone givenA single interventionist worked in both classrooms and was told not to discuss differences with the other interventionists.
“One interventionist was employed in both classrooms and was instructed not to discuss differences with the other interventionists.”
Quote in the paperNot a substantial claimProbably not a substantial claim: may not pass S3 (load-bearing).
PremisecitationCertain teaching strategies common to both interventions are essential for typically developing children to develop flexible, generative language.
“Some of these strategies are vital ingredients for development of flexible and generative language in typically developing children (Barsalou, Breazeal, & Smith, 2007; Booth & Waxman, 2002).”
Quote in the paperNot a substantial claim0 of 2 sources checked- cites Barsalou, Breazeal, & Smith, 2007
Not checked in the free run.
- cites Booth & Waxman, 2002
Not checked in the free run.
Classified as probably not a substantial claim.
PremisecitationMundy and colleagues proposed that joint processing of one's own and others' actions and objects of attention leads to an automaticity that is likely fundamental to symbolic and social cognitive learning.
“According to Mundy, Sullivan, and Mastergeorge (2009), joint processing of one’s own and others’ actions and objects of attention gives way to an automaticity that is likely fundamental to symbolic and social cognitive learning.”
Quote in the paperSubstantial claim0 of 1 sources checked- cites Mundy, Sullivan, and Mastergeorge (2009)
Not checked in the free run.
Classified as probably not a substantial claim.
Interpretationown dataThe results shed light on how social and communication development can change in toddlers with ASD.
“Our findings provide insights into the plasticity of social and communication development in toddlers with ASD.”
Quote in the paperSubstantial claimMay combine two claims.
Interpretationown dataAdding social engagement targets to intervention improves short-term outcomes without additional intervention cost.
“Adding social engagement targets to intervention improves short-term outcome at no additional cost to the intervention.”
Quote in the paperSubstantial claimMay combine two claims.
Study design and conductown dataThe groups did not differ in socioeconomic status, proportion of non-Caucasian participants, or amount of outside speech-language treatment during the intervention or follow-up.
“Table 1 shows that there were no group differences in socioeconomic status (Hollingshead, 1975) scores (p=0.741), proportion of non-Caucasian participants (p=0.94), or amount of outside speech-language treatment during the intervention (p=0.268) or during the follow-up period (p=0.696).”
Quote in the paperSubstantial claimMay combine two claims.
Study design and conductown dataThe Interpersonal Synchrony and Non-Interpersonal Synchrony groups received similar amounts of classroom intervention (means 205.66 and 196.21 hours), with no significant difference.
“The IS and Non-IS groups received a mean (standard deviation) of 205.66 (18.63) and 196.21 (28.4) hours of classroom-based intervention, which was not significantly different (p=0.17).”
Quote in the paperSubstantial claimClassified as probably not a substantial claim.
Study design and conductown dataThe reported effects are intent-to-treat estimates of assignment to the Interpersonal Synchrony intervention, regardless of intervention actually received.
“The effects estimated are intent-to-treat effects, which estimate the effect of assignment to the IS intervention, regardless of the amount of intervention actually received.”
Quote in the paperSubstantial claimClassified as probably not a substantial claim. May combine two claims.
Study design and conductown dataBefore randomization, children were matched into pairs on MSEL Receptive Language and Visual Reception T scores and ADOS Social Interaction algorithm scores, and one child from each pair was randomly assigned to the Interpersonal Synchrony group.
“Prior to randomization, children were placed into matched pairs based on MSEL Receptive Language and VR T scores and ADOS Social Interaction algorithm scores. Within each pair, one child was randomly selected for the IS group.”
Quote in the paperSubstantial claimProbably not a substantial claim: may not pass S3 (load-bearing).
Interpretationnone givenThis study adds to the limited literature on core communication and social deficits in young children with autism.
“The present study contributes to a small body of literature focused on core deficits of communication and social functioning in young children with autism.”
Quote in the paperNot a substantial claimProbably not a substantial claim: may not pass S3 (load-bearing).
PremisecitationMany intervention studies of preschoolers with ASD have found improvements in nonverbal cognition and language.
“Numerous intervention studies involving preschoolers with ASD have also reported gains in nonverbal cognition and language (reviewed by Rogers & Vismara, 2008)”
Quote in the paperNot a substantial claim0 of 1 sources checked- cites Rogers & Vismara, 2008
Not checked in the free run.
The paper relies on this without support.
This trial is the first randomized controlled trial in two-year-olds with ASD to test an intervention component aimed at core social deficits.
“To our knowledge, this is the first RCT involving two-year-olds designed to assess effects of an intervention ingredient on social development.”
“This is the first RCT involving two-year-olds with ASD to assess the efficacy of an intervention ingredient targeting core social deficits of autism.”
The paper relies on this without support.
Most autism intervention research has studied children aged 3 and older.
“Autism intervention studies have focused largely on children age 3 and older.”
The paper relies on this without support.
No randomized trial had previously demonstrated improvement in core social deficits among toddlers with ASD.
“No randomized controlled trials (RCTs) have shown evidence for improvement in core social deficits of autism in toddlers with ASD.”
The paper relies on this without support.
The AEPS curriculum also covers imitation and joint attention goals, though less thoroughly than the IS curriculum.
“In addition, the AEPS curriculum includes imitation and joint attention goals, albeit in less detail than in the IS curriculum.”
Claims other papers make about this one
Each is checked against this paper’s own text: does it say what the citing paper says it does?
In a toddler classroom study, children in the experimental classroom showed significantly better imitation skills at the end of treatment compared to controls, but no other group main effects were noted at the end of treatment or in cognitive and language outcomes six months later.
“Compared to children in the control classroom, the children in the experimental classroom showed significantly better imitation skills at the end of treatment. No other group main effects were noted at the end of treatment or in cognitive and language outcomes six months later.”
From Longitudinal follow-up of children with autism receiving targeted interventions on joint attention and play (2012) · cites this paper as [24]
There were studies rated as having a strong quality of evidence but equivocal findings.
“Specifically, there were studies rated as having a strong quality of evidence but equivocal findings. 16”
From Early Intervention for Children With Autism Spectrum Disorder Under 3 Years of Age: Recommendations for Practice and Research (2015) · cites this paper as [16]
Some recent studies suggest that positive outcomes are possible with fewer hours of direct therapist involvement for young toddlers with ASD, particularly when parents are actively engaged in the treatment process.
“However, some recent studies have suggested the possibility of positive outcomes with fewer hours of direct therapist involvement for young toddlers with ASD, particularly when parents are actively engaged in the treatment process.”
From Early Intervention for Children With Autism Spectrum Disorder Under 3 Years of Age: Recommendations for Practice and Research (2015) · cites this paper as [16]
A recent study in toddlers with ASD found few differences between a comprehensive intervention and the same intervention without a specific ingredient, except for an apparent benefit of imitation in one group.
“Few differences emerged in this study except for the apparent benefit of imitation in 1 group.”
From Early Intervention for Children With Autism Spectrum Disorder Under 3 Years of Age: Recommendations for Practice and Research (2015) · cites this paper as [16]
Gains in some social communication skills (e.g., play, joint attention, imitation) were demonstrated in some studies when directly targeted in interventions of relatively low intensity, based on hours per week or length of treatment.
“For example, gains in some social communication skills (eg, play, joint attention, imitation) were demonstrated in some studies when directly targeted in interventions of relatively low intensity (based on hours per week or length of treatment). 16 , 18 , 20”
From Early Intervention for Children With Autism Spectrum Disorder Under 3 Years of Age: Recommendations for Practice and Research (2015) · cites this paper as [16]
Self-check
Percentages, sums and reported differences re-computed from the paper’s own numbers.
Each contradiction between two passages listed here was confirmed by an independent check.
Two p-values are given for the same VR joint test
MinorThe results give p=0.16 for the joint test of between-group differences in VR scores, then refer to that joint test as having p=0.13.
“chi-square=5.24, df=3, p=0.16 for VR”
“the lack of significance of the joint test of differences (p=0.13)”
The abstract overstates the significance of time effects
MinorThe abstract says every outcome had a time-effect p-value below 0.001, whereas the results give a range extending to 0.01.
“A significant time effect was found for all outcomes (p<0.001)”
“Significant time effects were found for the full sample for all variables (p’s=0.00 to 0.01; Table 2)”
The IJA chi-square result conflicts with the reported significance
MinorBoth tests have three degrees of freedom, yet the reported IJA chi-square of 365 is much larger than the significant SEI chi-square of 9.98 while its reported p-value is much larger. With the same degrees of freedom, a larger chi-square cannot have a larger p-value.
“but not for IJA (chi-square=365, df=3, p=0.30)”
“A statistically significant overall main effect was found for SEI (chi-square 9.98, df=3, p=0.02; Table 2)”
The discussion attributes significant gains to both groups across outcomes
MinorThe discussion says both groups made significant gains in primary and secondary outcomes, but the results say the Non-IS group showed significant growth only in expressive language.
“both groups made significant gains over time in primary as well as secondary outcomes”
“the Non-IS group showed significant growth only on the EL T score (p=0.01)”
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- Authors
- Landa, R. J., Holman, K. C., O’Neill, A. H., & Stuart, E. A.
- Affiliations
- Kennedy Krieger Institute (US)
- Towson University (US)
- University of Maryland, College Park (US)
- Johns Hopkins University (US)
- Venue
- Journal of Child Psychology and Psychiatry
- Publisher
- Wiley
- Published
- 2010-12-03
- Volume
- 52
- Issue
- 1
- Pages
- 13-21
- ISSN
- 0021-9630 (ISSN-L)
- 1469-7610
- PMC
- PMC3059234
- OpenAlex
- W2165585388
- Semantic Scholar
- dead6a974b2fc69bcad4aa0d9307ff91bd281b7a
- Cited by
- 353
- References
- 41
- Citations by year
- 2026: 8 · 2025: 16 · 2024: 15 · 2023: 16 · 2022: 21 · 2021: 24 · 2020: 26 · 2019: 26 · 2018: 27 · 2017: 22 · 2016: 30 · 2015: 28 · 2014: 35 · 2013: 22 · 2012: 25
- FWCI
- 11.23
- Type
- journal article
- Language
- en
- Open access
- green
- www.ncbi.nlm.nih.gov
- Locations
- Journal of Child Psychology and Psychiatry (publishedVersion)
- PubMed (publishedVersion)
- Europe PMC (PubMed Central) (acceptedVersion)
- PubMed Central (acceptedVersion)
- Funders
- National Institute of Mental Health (U54MH066417)
- Topics
- Life Sciences › Neuroscience › Cognitive Neuroscience › Autism Spectrum Disorder Research
- Social Sciences › Psychology › Developmental and Educational Psychology › Behavioral and Psychological Studies
- Social Sciences › Psychology › Developmental and Educational Psychology › Child and Animal Learning Development
- Keywords
- autism spectrum disorder, toddlers, joint attention, affect sharing, eye contact, social communication intervention, expressive language, nonverbal cognition, developmental plasticity, parent training
- MeSH terms
- Behavior Therapy, Child Development Disorders, Pervasive, Child, Preschool, Cognition, Communication, Female, Follow-Up Studies, Humans, Imitative Behavior, Infant, Male, Neuropsychological Tests, Parents, Verbal Behavior, Treatment Outcome
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
Claims read by deepseek-v4.1-flash under definition version 3 (extract-v3) on 2026-10-06.
Classified by jev-1.13-20260917 (gold-guideline-v0.2) on 2026-10-06.
Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
What counts as a claim ›How we measure confidence ›How we check this ›
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