Improvised herding: Mapping biobehavioral mechanisms that underlie group efficacy during improvised social interaction
Open accessAbstract
Improvisation is a natural occurring phenomenon that is central to social interaction. Yet, improvisation is an understudied area in group processes and intergroup relations. Here we build on theory and research about human herding to study the contributions of improvisation on group efficacy and its biobehavioral underpinnings. We employed a novel multimodal approach and integrative method when observing face‐to‐face interactions—51 triads (total N = 153) drummed together in spontaneous‐free improvisations as a group, while their electrodermal activity was monitored simultaneously with their second‐by‐second rhythmic coordination on a shared electronic drum machine. Our results show that three hypothesized factors of human herding—physiological synchrony, behavioral coordination, and emotional contagion—predict a sense of group efficacy in its group members. These findings are some of the first to show herding at three levels (physiological, behavioral, and mental) in a single study and lay a basis for understanding the role of improvisation in social interaction.
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Written from the paper’s full text.
TL;DR
In 48 triads who improvised together on electronic drums, group efficacy was predicted by higher individual emotional contagion, higher behavioral drumming coordination, and lower group electrodermal activity (EDA) synchrony. EDA synchrony during improvisation was greater than chance, supporting herding across physiological, behavioral, and mental levels.
Key findings
- EDA synchrony during improvised drumming was significantly greater than random pairings: real data M = 0.47, SD = 0.45 vs. random M = 0.29, SD = 0.37; Kolmogorov–Smirnov p = 4.28 × 10⁻⁵.
- In a linear mixed model predicting group efficacy, significant predictors were emotional contagion (estimate = 0.40, SE = 0.18, p = .03), drumming coordination (estimate = 0.001, SE = 0.001, p = .01), and lower group EDA synchrony (estimate = −0.80, SE = 0.37, p = .04).
- Group efficacy was positively correlated with emotional contagion (r = .17, p = .041); group-level drumming coordination and EDA synchrony were not significantly correlated (r = −.01, p = .994).
- Group BPM did not predict group efficacy (estimate = 0.005, SE = 0.004, p = .19) but did predict self-reported group synchrony (estimate = 0.009, SE = 0.003, p < .01), adding 18% variance above behavioral coordination (r² change = .18, F change = 12.67, p < .001); group-level IBI synchrony did not impact the group-efficacy model (estimate = 0.20, SE = 0.68, p = .77).
Methods
- 51 triads (total N = 153) of Bar-Ilan University undergraduate psychology students were recruited; after exclusions, final analyses used 144 participants (32 men) in 48 groups. Participants completed a 5-min baseline, then improvised together on electronic drums for 4 min without a beat or talking, while EDA was recorded simultaneously.
- Measures included EDA synchrony (cross-correlation of each dyad with ±3 s lag, averaged to group level), behavioral drumming coordination (all three members hitting within a 30-ms window, derived from MIDI data), trait emotional contagion, and a four-item group-efficacy scale; in-group agreement indices were ICC1 = 0.086, ICC2 = 0.877, rWG = 0.795.
- Main analysis was a linear mixed model with group efficacy as the dependent variable and group-level EDA synchrony, individual trait emotional contagion, and group-level drumming coordination as predictors, controlling for prior structured-task condition and musical knowledge; additional models tested BPM and IBI synchrony.
Limitations
- The paper states that the relationship between multimodal synchronies is complex and not fully understood, that EDA synchrony and drumming coordination were uncorrelated, and that future studies are needed to address these questions.
- The paper states that heart-rate synchrony did not significantly impact group efficacy during improvisation, contrasting prior structured-drumming findings, and offers outcome-dependent and task-dependent explanations that require further validation.
- Evident from the text: the sample was undergraduate psychology students at one university, predominantly women (32 men among 144 participants), with low prior familiarity and low musical knowledge; expert musicians were excluded, and the laboratory drumming improvisation may not generalize to other social interactions.
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Claims the paper makes
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- Findingown data
Three hypothesized factors of human herding-physiological synchrony, behavioral coordination, and emotional contagion-predict a sense of group efficacy in group members.
“Our results show that three hypothesized factors of human herding-physiological synchrony, behavioral coordination, and emotional contagion-predict a sense of group efficacy in its group members.”
Quote in the paperSubstantial claim - Findingown data
Drumming coordination positively predicts self-reported group synchrony (β = 0.00, p = .01).
“Drumming coordination 0.00 0.00 2.92 (41.98) 0.01 0.00, 0.00”
Quote in the paperSubstantial claim - Findingown data
A sense of group efficacy was positively correlated with emotional contagion (r = .17, p = .041).
“As can be seen in Table S2, a sense of group efficacy was positively correlated with emotional contagion (r = .17,p = .041),and group-level behavioral drumming coordination and EDA synchrony were not significantly correlated (r = -.01,p = .994).”
Quote in the paperNot a substantial claim - Findingown data
Electrodermal activity synchrony significantly predicted a sense of synchrony (estimate = -0.59, SE = 0.27, p < .05).
“Also, as can be seen, EDA synchrony and drumming coordination also were significant predicators of a sense of synchrony (estimate = -0.59,SE = 0.27, p < .05for EDA synchrony and estimate = 0.001, SE = 0.0001, p < .01 for drumming coordination).”
Quote in the paperSubstantial claim - Findingown data
Group BPM positively predicts self-reported group synchrony (β = 0.01, p = .00).
“Group BPM 0.01 0.00 3.30 (44.28) 0.00 0.00, 0.01”
Quote in the paperSubstantial claim
- Findingown data
There is no correlation between EDA synchrony and drumming coordination.
“It is important to note that we found no correlation between EDA synchrony and drumming coordination.”
Quote in the paperSubstantial claim - Findingown data
Physiological synchronization in group-level interbeat interval did not impact the model (estimate = 0.20, SE = 0.68, p = .77).
“We found that physiological synchronization in group-level IBI did not impact the model (estimate = 0.20, SE = 0.68, p = .77)(see Table S4).”
Quote in the paperSubstantial claim - Findingown data
Musical knowledge does not significantly predict group efficacy (β = -0.20, p = .08).
“Musical knowledge -0.20 0.11 -1.78 (91.10) .08 -0.43, 0.02”
Quote in the paperNot a substantial claim - Findingown data
Prior task control does not significantly predict group efficacy (β = -0.31, p = .19).
“Prior task control -0.31 0.23 -1.32 (42.96) .19-0.78, 0.16”
Quote in the paperNot a substantial claim - Findingown data
Emotional contagion does not significantly predict self-reported group synchrony (β = 0.12, p = .33).
“Emotional contagion 0.12 0.12 0.98 (91.06) 0.33 -0.12, 0.35”
Quote in the paperNot a substantial claim - Findingown data
Drumming coordination significantly predicted a sense of synchrony (estimate = 0.001, SE = 0.0001, p < .01).
“Also, as can be seen, EDA synchrony and drumming coordination also were significant predicators of a sense of synchrony (estimate = -0.59,SE = 0.27, p < .05for EDA synchrony and estimate = 0.001, SE = 0.0001, p < .01 for drumming coordination).”
Quote in the paperNot a substantial claim - Findingown data
Heart rate synchrony at the group level did not significantly impact group efficacy during the improvisational task.
“Finally, we found that heart rate synchrony at the group level did not significantly impact group efficacy during our improvisational task.”
Quote in the paperSubstantial claim - Findingown data
Group-level behavioral drumming coordination and electrodermal activity synchrony were not significantly correlated (r = -.01, p = .994).
“As can be seen in Table S2, a sense of group efficacy was positively correlated with emotional contagion (r = .17,p = .041),and group-level behavioral drumming coordination and EDA synchrony were not significantly correlated (r = -.01,p = .994).”
Quote in the paperNot a substantial claim - Findingown data
Musical knowledge does not significantly predict self-reported group synchrony (β = -0.07, p = .34).
“Musical knowledge -0.07 0.07 -0.96 (91.16) 0.34 -0.22, 0.08”
Quote in the paperNot a substantial claim - Findingown data
Beats per minute did not contribute significantly to the model for group efficacy (estimate = 0.005, SE = 0.004; p = .19).
“BPM did not contribute significantly to the model (estimate = 0.005, SE = 0.004; p = .19)(Table S5).”
Quote in the paperSubstantial claim - Findingown data
Beats per minute predicted a sense of synchrony above and beyond behavioral coordination by adding 18% of the variance (r2 change = .18, F change = 12.67, p < .001).
“Results from stepwise linear analysis (with drumming coordination in step 1 and BPM in step 2) showed that BPM predicted a sense of synchrony above and beyond behavioral coordination by adding a 18% of the variance (r 2 change = .18,F change = 12.67, p < .001)(Table S6).”
Quote in the paperSubstantial claim - Findingown data
Group EDA synchrony negatively predicts group efficacy (β = -0.80, p = .04).
“Group EDA synchrony -0.80 0.37 -2.18 (42.76) .04-1.55, -0.06”
Quote in the paperSubstantial claim - Findingown data
The real and random distributions of electrodermal activity synchrony are different (Kolmogorov-Smirnoff test p = 4.28 × 10^-05; Random M = 0.29, SD = 0.37; Real M = 0.47, SD = 0.45).
“Results of the Kolmogorov-Smirnoff test for examining differences between distributions indicate that the real and random distributions are indeed different (p = 4.28 × 10 -05 ; Random: M = 0.29, SD = 0.37; Real: M = 0.47, SD = 0.45).”
Quote in the paperSubstantial claim - Findingown data
Beats per minute measures were not correlated with behavioral coordination (r = .000, p = .99).
“The BMP measures were not correlated with behavioral coordination (r = .000,p = .99),suggesting that the BPM and sense of synchrony does not reflect actual drumming coordination, just the perception of it.”
Quote in the paperSubstantial claim - Findingown data
Group EDA synchrony negatively predicts self-reported group synchrony (β = -0.59, p = .03).
“Group EDA synchrony -0.59 0.27 -2.22 (41.97) 0.03 -1.13, -0.05”
Quote in the paperSubstantial claim - Findingown data
Prior task control does not significantly predict self-reported group synchrony (β = 0.09, p = .61).
“Prior task control 0.09 0.17 0.51 (42.34) 0.61 -0.25, 0.42”
Quote in the paperNot a substantial claim - Findingown data
Drumming coordination positively predicts group efficacy (β = 0.001, p = .01).
“Drumming coordination 0.001 0.001 2.96 (42.79) .010.0002, 0.0013”
Quote in the paperSubstantial claim - Findingown data
The real data set comprises higher electrodermal activity synchrony scores compared to the random data set.
“As can be seen, the real data set comprises higher EDA synchrony scores compared to the random data set, which supports the notion that EDA synchrony in improvised drumming was significantly larger than random and due to the actual group interaction and not spurious or due to similar task conditions across all groups.”
Quote in the paperSubstantial claim - Findingown data
Emotional contagion positively predicts group efficacy (β = 0.40, p = .03).
“Emotional contagion 0.40 0.18 2.18 (90.98) .030.03, 0.76”
Quote in the paperSubstantial claim - Findingown data
Greater beats per minute was associated with a greater sense of synchrony in the group (estimate = 0.009, SE = 0.003, p < .01).
“BPM was significant in this model, with the greater the BPM associated with a greater sense of synchrony in the group (estimate = 0.009, SE = 0.003, p < .01)(Table 2).”
Quote in the paperSubstantial claim - Interpretationcitation
The integrative method overcomes at least two important limitations of prior research on social functioning.
“This integrative method overcomes at least two important limitations of prior research on social functioning (Dikker et al., 2017).”
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- Premisecitation
In several group studies, synchrony in electrodermal activity was found to relate, either negatively or positively depending on context, to relational and affective aspects of group processes, such as positive affect during game playing or group tensions when building origami boats together.
“Specifically, in several group studies, synchrony in electrodermal activity (EDA) was found to relate (either negatively or positively, depending on context) (Danyluck & Page-Gould, 2019) to relational and affective aspects of group processes, such as positive affect during game playing (Chanel et al., 2012) or group tensions when building origami boats together (Mønster et al., 2016).”
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- cites Chanel et al., 2012
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- cites Mønster et al., 2016
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- Premisecitation
Observation of real face-to-face drumming interactions in groups of triads can more closely represent group processes compared to individual paradigms.
“Our methodology involved observation of real face-to-face drumming interactions in groups of triads, which can more closely represent group processes compared to individual paradigms (Moreland, 2010).”
Quote in the paperSubstantial claim0 of 1 sources checked- cites Moreland, 2010
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- Premisecitation
Recent theory and research on herding suggest that physiological synchrony, behavioral coordination, and emotional contagion help construct multiple levels of social alignment.
“Recent theory and research on herding suggest that these three constructs help construct multiple levels of social alignment (Shamay-Tsoory et al., 2019).”
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- Study design and conductown data
The sample size of 144 met the power analysis criterion.
“Our sample size of 144 met this criterion.”
Quote in the paperSubstantial claim - Premisecitation
Physiological synchrony in electrodermal activity was related to group performance in numerous studies.
“Physiological synchrony in EDA was also related to group performance in numerous studies (Henning et al., 2001;Montague et al., 2014;Schneider et al., 2020).”
Quote in the paperNot a substantial claim0 of 3 sources checked- cites Henning et al., 2001
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- cites Montague et al., 2014
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- cites Schneider et al., 2020
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- Premisecitation
Groups with high electrodermal activity synchrony have been shown to experience dynamics of tension or negative affect.
“This is because groups with high EDA synchrony have been shown to experience dynamics of tension or negative affect”
Quote in the paperSubstantial claim0 of 1 sources checked- cites Mønster et al., 2016
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- Study design and conductcitation
A power analysis suggested a total sample of 138 to detect an effect size of f2 = 0.15, with five predictors, 95% power, and alpha at .05.
“To determine a sufficient sample size, we conducted a power analysis in G*Power (Faul et al., 2007), which suggested a total sample of 138 to detect an effect size of f 2 = 0.15, with five predictors, 95% power, and an alpha at .05.”
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- Study design and conductreasoning
The research captures actual group dynamics rather than single cases and dyads.
“First, our research captures actual groups dynamics rather than single cases and dyads.”
Quote in the paperSubstantial claim - Premisecitation
Physiological synchrony during face-to-face group interaction has been rarely measured due to challenges in recording and calculating synchronization in multiple physiological signals from multiple individuals at once.
“Second, we assess physiological synchrony during face-to-face group interaction, which has been rarely measured due to the challenges in recording and then calculating synchronization in multiple physiological signals from multiple individuals at once (for exceptions, see [Dikker et al., 2017;Gordon et al., 2020;Mønster et al., 2016]).”
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- cites Gordon et al., 2020
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- cites Mønster et al., 2016
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- Premisecitation
Emotional contagion is a highly relevant mental mechanism within herding that can be observed at the individual level within groups.
“It is a highly relevant mental mechanism within herding that can be observed at the individual level within groups (Juslin et al., 2008).”
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- Premisecitation
Task difficulty is correlated with EDA.
“Since task difficulty is correlated with EDA (Malmberg et al., 2019;Mønster et al., 2016)”
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- cites Mønster et al., 2016
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- Premisecitation
Learning to drum increased functional connectivity in the right IFG and the right dorsolateral prefrontal cortex (r-DLPFC) in autistic adults.
“An fMRI study of 32 autistic adults showed that learning to drum increased functional connectivity in the right IFG and the right dorsolateral prefrontal cortex (r-DLPFC) (Cahart et al., 2022).”
Quote in the paperNot a substantial claim0 of 1 sources checked- cites Cahart et al., 2022
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- Premisecitation
Reward networks in the brain, including dopamine and cortical systems, respond to levels of predictability in music and to perceived tension in achieving an auditory resolution.
“A volume of fMRI studies shows that reward networks in the brain, including dopamine and cortical systems, respond to not only to levels of predictability in music, but also to perceived tension (e.g., uncertainty) in achieving an auditory resolution (Salimpoor et al., 2015).”
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- Interpretationreasoning
An influence of isochronicity on social grouping may be one of the reasons why rhythmic drumming has been suggested to be an effective intervention for populations with social difficulties.
“This suggests that an influence of isochronicity on social grouping may also be one of the reasons why rhythmic drumming has been suggested to be an effective intervention”
Quote in the paperSubstantial claim - Premisecitation
The multilevel model of social alignment in human herding can be situated within the framework of predictive coding.
“This model can be situated within the framework of predictive coding (Shamay-Tsoory et al., 2019).”
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- Premisecitation
There is a common overlap in the neural substrates of rhythmic behavior across domains.
“Research shows that there is a common overlap in the neural substrates of rhythmic behavior across these domains (Kotz et al., 2018).”
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- Premisecitation
The DLPFC is associated with perspective-taking, a pivotal component of empathy.
“The DLPFC is associated with perspective-taking (Moriguchi et al., 2007;Taiwo et al., 2021), a pivotal component of empathy (Lamm et al., 2007)”
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There is lateral deactivation in the dorsolateral prefrontal cortex (DLPFC) during solo piano jazz improvisation.
“There is evidence for lateral deactivation in the dorsolateral prefrontal cortex (DLPFC) during solo piano jazz improvisation (Limb & Braun, 2008)”
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- Interpretationreasoning
Each modality of synchrony seems to contribute independently to the prediction of group outcomes.
“Each modality seems to contribute independently of the prediction of group outcomes.”
Quote in the paperSubstantial claim - Premisecitation
Brain imaging studies show that when musicians play an improvised piece of music, as opposed to playing a memorized piece, there is increased activation of the medial prefrontal cortex.
“For example, brain imaging studies show that when musicians play an improvised piece of music (opposed to playing a memorized piece), there is increased activation of the mPFC (Limb & Braun, 2008).”
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The DLPFC is activated during social piano improvisation in the context of 'trading fours' in dyads.
“whereas the DLPFC is shown to be activated during social piano improvisation in the context of”
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- Premisecitation
Isochronicity is a more robust feature in music compared to speech and other domains.
“However, isochronicity, which refers to the continual phrase reproduction of oscillation (frequency of phase), is a more robust feature in music compared to speech and other domains (Kotz et al., 2018).”
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- Premisecitation
Drumming coordination does not always relate to physiological coordination.
“Indeed, we have seen in a previous study that drumming coordination does not always relate to physiological coordination (Gordon et al., 2020).”
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- May combine two claims. 16
- Classified as probably not a substantial claim. 26
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Findingown dataGroup efficacy scores after the improvisational task were predicted by higher individual-level emotional contagion, higher drumming group coordination, and lower group electrodermal activity synchrony.
“Results from this analysis showed that group efficacy scores after the improvisational task were predicted by higher individual-level emotional contagion, higher drumming group coordination, and lower group EDA synchrony (Table 1).”
Quote in the paperSubstantial claimClassified as probably not a substantial claim.
PremisecitationThe multilevel model of social alignment posits a feedback loop between three components across each level: a gap monitoring system, an observation-execution system, and a reward system.
“This multilevel model of social alignment argues for a feedback loop between three components across each level: (1) a gap monitoring system that detects the distance (real or perceived) between the self and others (comprising the dorsomedial prefrontal cortex [dmPFC]), dorsal anterior cingulate cortex, and anterior insula; (2) an observationexecution system regulating social alignment (comprising”
Quote in the paperSubstantial claim0 of 1 sources checked- cites Shamay-Tsoory et al., 2019
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PremisecitationAcross different measures of the autonomic nervous system, physiological synchrony has been shown to link to relationship dynamics within groups and to group performance.
“Across different measures of the autonomic nervous system (ANS), physiological synchrony has been shown to link to relationship dynamics within groups and to group performance (Gordon et al., 2020;Palumbo et al., 2017).”
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- cites Palumbo et al., 2017
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Study design and conductown dataOne group was dropped from analyses because a participant reported high levels of distress and could not complete the study.
“We dropped one group from the analyses since a participant reported high levels of distress and could not complete the study.”
Quote in the paperNot a substantial claimMay combine two claims.
InterpretationreasoningThe increase from dyads to triads allows inferences about groups, which are not mere extensions of dyads but have unique processes and dynamics.
“The increase from dyads to triads is significant-it allows us to make inferences about groups, which are not mere extensions of dyads, but rather have unique processes and dynamics that can be addressed.”
Quote in the paperNot a substantial claimProbably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.
PremisecitationCollective efficacy has been previously related to performance in groups and to some aspects of group cohesion.
“Also termed collective efficacy (Watson et al., 2001), this construct has been previously related to performance in groups (Chang & Bordia, 2001;Hodges & Carron, 1992;Kozub & McDonnell, 2000;Lent et al., 2006;Leo et al., 2015;Spink, 2016) and to some aspects of group cohesion (Paskevich et al., 1999).”
Quote in the paperNot a substantial claim0 of 3 sources checked- cites Watson et al., 2001
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- cites Chang & Bordia, 2001
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- cites Paskevich et al., 1999
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Interpretationnone givenThe unstructured improvisational task mimicked the unstructured aspects of real-life social interactions in a way that prior laboratory experiments struggle to reproduce.
“This improvisational task mimicked the unstructured aspects of real-life social interactions in a way that prior laboratory experiments struggle to reproduce.”
Quote in the paperNot a substantial claimClassified as probably not a substantial claim.
InterpretationcitationThe three components of social alignment provide an initial model and brain basis in which to investigate a shared sense of group efficacy.
“These three components of social alignment provide an initial model and brain basis in which to investigate a shared sense of group efficacy.”
Quote in the paperSubstantial claimClassified as probably not a substantial claim.
Study design and conductreasoningFinal analyses were conducted on data from 144 participants nested in 48 groups.
“Final analyses were, therefore, conducted on the data collected from 144 participants (32 men) nested in 48 groups.”
Quote in the paperSubstantial claimProbably not a substantial claim: may not pass S3 (load-bearing).
Study design and conductown dataDue to technical or biological issues in physiological data analysis, physiological data from additional two groups could not be used.
“Due to technical or biological issues in physiological data analysis, we could not use physiological data from additional two groups.”
Quote in the paperNot a substantial claimMay combine two claims.
InterpretationreasoningMoving beyond a dyadic paradigm enables measurement of group efficacy, which is a unique marker of group outcomes and less relevant for bonded dyads.
“Moving beyond a dyadic paradigm enables us to measure group efficacy, which is a unique marker of group outcomes and less relevant for bonded dyads.”
Quote in the paperNot a substantial claimProbably not a substantial claim: may not pass S3 (load-bearing).
PremisecitationCoordination during group drumming has been shown to correlate with a subjective sense of synchrony in group drumming.
“This coordination has been shown to correlate with a subjective sense of synchrony in group drumming (Gordon et al., 2020).”
Quote in the paperNot a substantial claim0 of 1 sources checked- cites Gordon et al., 2020
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Study design and conductcitationIn-group agreement indices were ICC1 = 0.086, ICC2 = 0.877, and rWG = 0.795, indicating high in-group agreement.
“The indices values were: ICC1 = 0.086, ICC2 = 0.877, rWG = 0.795.These values indicate high in-group agreement (Bliese, 1998;LeBreton & Senter, 2008;Lüdtke et al., 2011).”
Quote in the paperSubstantial claim0 of 3 sources checked- cites Bliese, 1998
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- cites LeBreton & Senter, 2008
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- cites Lüdtke et al., 2011
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Study design and conductcitationThe effect size f2 = 0.15 was chosen because it indicates small-medium effect sizes similar to previous models on effects of physiological synchrony for group outcomes.
“We set f 2 = 0.15 because it indicates small-medium effect sizes which were similar in the previous models we published on the effects of physiological synchrony for group outcomes (Gordon et al., 2020).”
Quote in the paperSubstantial claim0 of 1 sources checked- cites Gordon et al., 2020
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InterpretationreasoningThe critical role of improvised herding for group efficacy and the ability of multimodal investigation to uncover shared group processes.
“We further highlight the critical role of improvised herding for group efficacy and the ability of multimodal investigation to uncover shared group processes.”
Quote in the paperSubstantial claimClassified as probably not a substantial claim.
InterpretationcitationImprovisation leaves open the possibility for more naturally occurring processes of shifting between synchrony and asynchrony.
“Along similar lines, improvisation (compared to a structured synchrony task) leaves open the possibility for more naturally occurring processes of shifting between synchrony and asynchrony”
Quote in the paperSubstantial claimClassified as probably not a substantial claim. May combine two claims.
InterpretationreasoningEDA is more predictive of group efficacy, whereas IBI may be better at capturing cohesion.
“On a physiological level, it may be that EDA, which is a strict a measure of the sympathetic nervous system, is more predictive of group efficacy, whereas IBI is based on both sympathetic and parasympathetic outputs, and therefore may be better at capturing cohesion.”
Quote in the paperSubstantial claim- Rests on an assumption: EDA is a marker of the sympathetic branch of the autonomic nervous system.
- Rests on an assumption: IBI is based on both sympathetic and parasympathetic outputs.
Probably not a substantial claim: may not pass S3 (load-bearing).
Study design and conductown dataElectrodermal activity data were visually inspected and corrupted portions up to 5% were replaced by linear spline interpolation.
“When we found unusual peaks or sudden and unreasonable drops in the data, we used linear spline interpolation to replace the corrupted portions of the signal.We limited this to a maximum of 5% of each individual's data.”
Quote in the paperNot a substantial claimMay combine two claims.
InterpretationreasoningThe DLPFC may be an underlying mechanism in group improvisation and may impact group efficacy.
“the DLPFC may be an underling mechanism in group improvisation and have an impact on group efficacy.”
Quote in the paperSubstantial claimMay combine two claims.
Interpretationown dataElectrodermal activity synchrony in improvised drumming was significantly larger than random and due to the actual group interaction and not spurious or due to similar task conditions across all groups.
“which supports the notion that EDA synchrony in improvised drumming was significantly larger than random and due to the actual group interaction and not spurious or due to similar task conditions across all groups.”
Quote in the paperSubstantial claimProbably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.
PremisecitationBoth EDA and IBI were associated with both affective components of group performance and cognitive aspects.
“It is important to note that in a recent meta-analysis, both EDA and IBI were associated with both affective components of group performance (e.g., empathy and trust) and cognitive aspects (e.g., collective intelligence) (Mayo et al., 2021).”
Quote in the paperNot a substantial claim0 of 1 sources checked- cites Mayo et al., 2021
Not checked in the free run.
May combine two claims.
Study design and conductown dataSmoking habits and familiarity with group members did not impact the model significantly (smoking: estimate = 0.02, SE = 0.27, p = .98; familiarity: estimate = 0.23, SE = 0.20, p = .24).
“Both factors did not impact the model significantly (estimate = 0.02, SE = 0.27, p = .98for smoking habits, and estimate = 0.23, SE = 0.20, p = .24for familiarity) (see Table S3).”
Quote in the paperNot a substantial claimProbably not a substantial claim: may not pass S3 (load-bearing).
PremisecitationThere are continuous fluctuations in the relationship between motion synchrony and heart rate synchrony while drumming.
“In another study, we showed that there are continuous fluctuations in the relationship between motion synchrony and heart rate synchrony while drumming (Gordon et al., 2020).”
Quote in the paperNot a substantial claim0 of 1 sources checked- cites Gordon et al., 2020
Not checked in the free run.
Probably not a substantial claim: may not pass S3 (load-bearing).
PremisecitationThe DLPFC is activated in nonimprovisational musical tasks.
“The DLPFC is also shown to be activated in nonimprovisational musical tasks.”
Quote in the paperNot a substantial claimProbably not a substantial claim: may not pass S3 (load-bearing).
Study design and conductreasoningSix participants were discarded from physiological analyses according to the 5% rule.
“According to this rule, we discarded six participants from the physiological analyses, which included 144 participants.”
Quote in the paperNot a substantial claimProbably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.
PremisecitationPredictive coding theory posits that the brain compares top-down and bottom-up signals, and minimizes prediction errors by updating top-down models.
“Predictive coding argues that top-down input signals in the brain are compared with bottom-up signals that are centrally collected.”
Quote in the paperNot a substantial claim0 of 1 sources checked- cites Spratling, 2017
Not checked in the free run.
May combine two claims.
InterpretationreasoningThe medial prefrontal cortex may be an integrative neural site between group members, whereby self and group narratives are processed, contributing to the formation of group identity during improvised interactions.
“Since the mPFC is associated with autobiographical memory and narrative, it may be an integrative neural site between group-members, whereby self and group narratives are processed, contributing to the formation of group identity during improvised interactions.”
Quote in the paperNot a substantial claimClassified as probably not a substantial claim.
PremisecitationRhythm is a foundational element of music and non-musical domains including speech, animal communication, and movement.
“Rhythm is a foundational element of what we know today as music, and is also a foundational element of non-musical domains, including speech, animal communication, and movement (Kotz et al., 2018).”
Quote in the paperSubstantial claim0 of 1 sources checked- cites Kotz et al., 2018
Not checked in the free run.
Probably not a substantial claim: may not pass S3 (load-bearing).
PremisecitationListening to groove rhythm drumming activates the left dorsolateral prefrontal cortex (l-DLPFC).
“A study on groove rhythm, which is defined by rhythms that evoke dance, showed that listening to groove rhythm drumming (via”
Quote in the paperNot a substantial claim0 of 1 sources checked- cites Fukuie et al., 2022
Not checked in the free run.
May combine two claims.
Interpretationown dataBeats per minute and sense of synchrony does not reflect actual drumming coordination, just the perception of it.
“suggesting that the BPM and sense of synchrony does not reflect actual drumming coordination, just the perception of it.”
Quote in the paperSubstantial claimProbably not a substantial claim: may not pass S2 (checkable).
Study design and conductnone givenThe free improvisational task added ecological validity pertaining to the unstructured nature of many social interactions.
“One of the distinct features of our experiment was the free improvisational task which added ecological validity pertaining to the unstructured nature of many social interactions.”
Quote in the paperNot a substantial claimProbably not a substantial claim: may not pass S3 (load-bearing).
PremisecitationPhysiological synchrony also occurs in conflictual and competitive contexts.
“This is important in the case of an improvisational task that can feature auditory tension, particularly within the context of prior research, which shows that physiological synchrony also occurs in conflictual and competitive contexts (Danyluck & Page-Gould, 2018, 2019;Levenson & Gottman, 1983).”
Quote in the paperNot a substantial claim0 of 3 sources checked- cites Danyluck & Page-Gould, 2018
Not checked in the free run.
- cites Danyluck & Page-Gould, 2019
Not checked in the free run.
- cites Levenson & Gottman, 1983
Not checked in the free run.
Classified as probably not a substantial claim.
InterpretationreasoningThe improvisational nature of the task in this study may have introduced more task difficulty than the structured task in the previous study.
“Since task difficulty is correlated with EDA (Malmberg et al., 2019;Mønster et al., 2016), the improvisational nature of the task in this study may have introduced more task difficulty than the structured task in our previous study (Gordon et al., 2020).”
Quote in the paperSubstantial claimMay combine two claims.
Interpretationown dataThe paper's findings highlight the underlying interpersonal physiological and behavioral mechanisms of herding, along with individual-level mental mechanisms of contagion, that together give rise to group efficacy.
“Based on this novel method, our findings highlight the underlying interpersonal physiological and behavioral mechanisms of herding, along with individual-level mental mechanisms of contagion, that together give rise to group efficacy.”
Quote in the paperSubstantial claimClassified as probably not a substantial claim.
PremisecitationBrain activation during improvisation is domain specific, with variations depending on whether musical improvisation is done individually or in social settings.
“Prior research suggests that brain activation during improvisation is domain specific with variations dependent on whether musical improvisation is done individually or in social settings.”
Quote in the paperSubstantial claimClassified as probably not a substantial claim.
PremisecitationHeart rate synchrony was positively associated with group cohesion during a structured drumming task.
“This contrasts prior work that showed that heart rate synchrony was positively associated with group cohesion during a structured drumming task (Gordon et al., 2020).”
Quote in the paperSubstantial claim0 of 1 sources checked- cites Gordon et al., 2020
Not checked in the free run.
Probably not a substantial claim: may not pass S4 (based).
Interpretationnone givenThe article overcomes limitations of prior research by implementing a real face-to-face group interaction during an unstructured social setting using an improvisational drumming paradigm.
“In conclusion, this article overcomes the limitations of prior research by implementing a real face-to-face group interaction during an unstructured social setting using an improvisational drumming paradigm.”
Quote in the paperNot a substantial claimProbably not a substantial claim: may not pass S3 (load-bearing).
PremisecitationThe brain strives to minimize prediction errors by updating top-down models.
“According to theories of predictive coding, the brain strives to minimize prediction errors by updating the top-down models (Spratling, 2017).”
Quote in the paperNot a substantial claim0 of 1 sources checked- cites Spratling, 2017
Not checked in the free run.
The paper relies on this without support.
Improvisation is understudied in the study of group processes and intergroup relations.
“Yet, improvisation is an understudied area within the study of group processes and intergroup relations.”
The paper relies on this without support.
Previous research has yet to demonstrate the social consequences for such interpersonal functions in groups within a single design.
“This hypothesis may seem obvious, but previous research has yet to demonstrate the social consequences for such interpersonal functions in groups within a single design.”
The paper relies on this without support.
Each of the three components of herding—physiological synchrony, behavioral coordination, and emotional contagion—can be empirically observed at both individual and interpersonal levels.
“Each of these three components of herding-physiological synchrony, behavioral coordination, and emotional contagion-can be empirically observed at both individual and interpersonal levels.”
The paper relies on this without support.
EDA is a marker of the sympathetic branch of the autonomic nervous system.
“a marker of the sympathetic branch of the ANS”
The paper relies on this without support.
IBI is based on both sympathetic and parasympathetic outputs.
“IBI is based on both sympathetic and parasympathetic outputs”
The paper relies on this without support.
Group efficacy is distinct from group cohesion.
“group efficacy is distinct from group cohesion.”
The paper relies on this without support.
The group improvisational drumming task constitutes a form of human herding.
“Improvised herding”
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?
Much existing research on IPS has focused on contexts where individuals are explicitly instructed to perform a social task.
“Yet, to date, much of the existing research on IPS has focused on contexts where individuals are explicitly instructed to perform a social task.”
From Interpersonal Synchronization of Autonomic Physiology via Mere Visual Contact (2026) · cites this paper as [32]
The Introduction describes improvisation as understudied and gives examples of physiological-synchrony research involving group activities. The Discussion contrasts this study’s free improvisation with a structured synchrony task in the authors’ earlier work. These passages support the contrast, but do not establish that much existing IPS research explicitly instructs participants to perform a social task. (LLM, conf=0.77)
Experimental — accuracy not yet measured
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.
ICC2 is incompatible with ICC1 and the group size
MajorThe paper reports three participants per group. With groups of three, the reported ICC1 of 0.086 implies ICC2 = (3 × 0.086)/(1 + 2 × 0.086) ≈ 0.220, not 0.877. This affects the stated evidence for agreement among group members.
“The indices values were: ICC1 = 0.086, ICC2 = 0.877, rWG = 0.795.”
“144 participants (32 men) nested in 48 groups.”
The cited drumming study describes adolescents, not adults
MinorThe discussion describes Cahart et al. (2022) as a study of autistic adults, while the cited paper's title identifies its subjects as autistic adolescents.
“An fMRI study of 32 autistic adults showed that learning to drum increased functional connectivity in the right IFG and the right dorsolateral prefrontal cortex (r-DLPFC) (Cahart et al., 2022).”
“Cahart, M.-S., Amad, A., Draper, S. B., Lowry, R. G., Marino, L., Carey, C., Ginestet, C. E., Smith, M. S., & Williams, S. C. R. (2022). The effect of learning to drum on behavior and brain function in autistic adolescents.”
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Lin, D., Zhu, T., & Wang, Y. (2024) · Physiology & Behavior · doi:10.1016/j.physbeh.2023.114434 · Cited by 50 · see citing works
Laroche, J., Bachrach, A., & Noy, L. (2024) · BMC Neuroscience · doi:10.1186/s12868-024-00874-z · Cited by 17 · see citing works
Correlates of interpersonal physiological synchrony and sources of empirical heterogeneity
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Self-citationInterpersonal Synchronization of Autonomic Physiology via Mere Visual Contact
Koul, A., & Novembre, G. (2026) · Annals of the New York Academy of Sciences · doi:10.1111/nyas.70322 · Cited by 1 · see citing works
- Authors
- Greenberg, D. M., Milstein, N., Gilboa, A., Cohen, S., Haimovich, N., Siegman, S., Pinhasi, S., & Gordon, I.
- Affiliations
- Bar-Ilan University (IL)
- Corresponding author
- Gordon, Ilanit
- Venue
- Psychophysiology
- Publisher
- Wiley
- Published
- 2023-04-19
- Volume
- 60
- Issue
- 9
- Pages
- e14307-e14307
- ISSN
- 0048-5772 (ISSN-L)
- 1469-8986
- OpenAlex
- W4366351688
- Semantic Scholar
- da4553543c080ca6a8e17dfe4230e2bb7928f7b1
- Cited by
- 4
- References
- 73
- Citations by year
- 2026: 2 · 2024: 1 · 2023: 1
- FWCI
- 1.18
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Licence
- Locations
- Psychophysiology (publishedVersion, cc-by-nc)
- PubMed (publishedVersion)
- Apollo (University of Cambridge) (submittedVersion, cc-by-nc)
- SERVAL (Université de Lausanne) (submittedVersion)
- Funders
- Israel Science Foundation (1726/15, 2096/15)
- Topics
- Social Sciences › Psychology › Social Psychology › Action Observation and Synchronization
- Social Sciences › Psychology › Social Psychology › Team Dynamics and Performance
- Life Sciences › Neuroscience › Cognitive Neuroscience › Neuroscience and Music Perception
- Keywords
- improvisation, group efficacy, group process, intergroup relations, physiological synchrony, electrodermal activity, rhythmic coordination, emotional contagion, social interaction, drumming, triads
- MeSH terms
- Social Interaction, Emotions, Group Processes, Humans, Music
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 2026-10-10.
Classified by jev-1.13-20260917 (gold-guideline-v0.2) on 2026-10-10.
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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