Social Play Behavior Is Critical for the Development of Prefrontal Inhibitory Synapses and Cognitive Flexibility in Rats

Classified as probably not a substantial claim.

How experience-dependent plasticity contributes to the development of other brain structures such as the PFC remains largely unknown.

“However, how experience-dependent plasticity contributes to the development of other brain structures, such as the prefrontal cortex (PFC), remains largely unknown (Kolb et al., 2012;Larsen and Luna, 2018;Reh et al., 2020).”

• cites Kolb et al., 2012 sourcePartly supported

  The Sensory and Motor Experience section says it is not yet known whether common factors or multiple mechanisms drive experience-related synaptic changes in the PFC. That supports uncertainty about how the changes occur. But the Factors Influencing Prefrontal Development section reviews established effects of experience on PFC development, so the broader claim that its contribution remains largely unknown overstates the source. (LLM, conf=0.84)

  Experimental — accuracy not yet measured
• cites Larsen and Luna, 2018 sourceNot checked — no full text of the source
• cites Reh et al., 2020 sourceNot checked — no full text of the source

Probably not a substantial claim: may not pass S3 (load-bearing).

Sensory deprivation during development causes long-lasting deficits in sensory processing resulting from improper synaptic wiring.

“This process has been extensively studied in the sensory cortices, and it is long known that sensory deprivation during development causes long-lasting deficits in sensory processing resulting from improper synaptic wiring (Hensch, 2005;Gainey and Feldman, 2017).”

• cites Hensch, 2005 sourceNot checked — no full text of the source
• cites Gainey and Feldman, 2017 sourcePartly supported

  Section 3 reports that deprivation during the visual critical period can rapidly remove inhibitory synapses and precede a loss of visual-evoked spiking. It does not establish that developmental deprivation causes long-lasting sensory-processing deficits or that improper synaptic wiring causes those deficits; the Conclusion instead discusses short-term changes and subsequent recovery of firing rates. No page numbers are available in our copy. (LLM, conf=0.84)

  Experimental — accuracy not yet measured

Probably not a substantial claim: may not pass S3 (load-bearing).

Sensory deprivation induces specific alterations in inhibitory neurotransmission that affect adult sensory processing.

“It is well described that sensory deprivation induces specific alterations in inhibitory neurotransmission that affect adult sensory processing (Turrigiano and Nelson, 2004;Hensch, 2005;Rupert and Shea, 2022).”

• cites Turrigiano and Nelson, 2004 sourceNot checked — no full text of the source
• cites Hensch, 2005 sourceNot checked — no full text of the source
• cites Rupert and Shea, 2022 sourceSupported

Classified as probably not a substantial claim. May combine two claims.

Perisomatic synapses are made by PV and CCK basket cells, of which only the latter express CB1-R.

“Perisomatic synapses are made by parvalbumin (PV) and cholecystokinin (CCK) basket cells (Whissell et al., 2015), of which only the latter express the cannabinoid receptor 1 (CB1-R; Katona et al., 1999).”

• cites Whissell et al., 2015Not matched

  Couldn’t be matched to a paper in Crossref, so it can’t be checked.

• cites Katona et al., 1999 sourcePartly supported

  The section on CB1 expression in hippocampal basket cells and Table 1 show that CB1 is present in nearly all CCK-positive cells, supporting the main distinction. But Table 1 also reports CB1 in 6 of 130 PV-positive cells (4.6%), so the absolute claim that only CCK basket cells express it is not supported. (LLM, conf=0.88)

  Experimental — accuracy not yet measured

Classified as probably not a substantial claim.

The PFC-dependent PRL task depends on the integrity of the PFC.

“In order to assess the impact of SPD on cognitive flexibility, a PFC-dependent probabilistic reversal learning (PRL) task was used (Fig. 5A,B; Dalton et al., 2016;Verharen et al., 2020).”

• cites Dalton et al., 2016 sourceSupported
• cites Verharen et al., 2020 sourceSupported

Probably not a substantial claim: may not pass S3 (load-bearing).

A direct link between PFC PV cell activity and social behavior was recently demonstrated.

“a direct link between PFC PV cell activity and social behavior was recently demonstrated (Bicks et al., 2020;Sun et al., 2020).”

• cites Bicks et al., 2020 sourceSupported
• cites Sun et al., 2020 sourceSupported

Classified as probably not a substantial claim.

A reduction in PFC inhibition has previously been linked to impaired cognitive flexibility.

“A reduction in PFC inhibition has previously been linked to impaired cognitive flexibility (Gruber et al., 2010)”

• cites Gruber et al., 2010 sourceSupported

Probably not a substantial claim: may not pass S3 (load-bearing).

Alterations in PV cells during development shape cognitive capacities in adulthood.

“Alterations in PV cells during development are shown to shape cognitive capacities in adulthood”

• cites Donato et al., 2015 sourceNot checked — no full text of the source
• cites Mukherjee et al., 2019 sourceNot checked — no full text of the source
• cites Canetta et al., 2022 sourceSupported

Classified as probably not a substantial claim.

Changes in PFC network activity directly affect cognitive and social skills.

“Changes in PFC network activity directly affect cognitive and social skills”

• cites Yizhar et al., 2011 sourceSupported
• cites Dalton et al., 2016 sourcePartly supported

  The lOFC inactivation results report impaired probabilistic reversal learning in rats, supporting an effect of prefrontal activity on a specific cognitive ability. The paper does not establish effects on social skills or make a general claim about PFC network activity. (LLM, conf=0.88)

  Experimental — accuracy not yet measured
• cites Verharen et al., 2020 sourcePartly supported

  The Discussion (page unavailable) reports that inactivating several rat PFC subregions impaired probabilistic reversal learning, supporting an effect on a specific cognitive process. It does not report effects on social skills, and its findings about rat PFC subregions do not establish the broader claim about PFC network activity. (LLM, conf=0.86)

  Experimental — accuracy not yet measured

Classified as probably not a substantial claim.

A similar increase in reversals was reported after prelimbic mPFC inactivation.

“A similar increase in reversals was also reported after prelimbic mPFC inactivation (Dalton et al., 2016)”

• cites Dalton et al., 2016 sourceSupported

May combine two claims.

Reduced PV and CB1 expression may indicate a reduced activity level in PV cells and an altered endocannabinoid tone.

“This may indicate a reduced activity level in PV cells (Donato et al., 2013;Caballero et al., 2014) and an altered endocannabinoid tone”

• cites Donato et al., 2013 sourceNot checked — no full text of the source
• cites Caballero et al., 2014 sourceSupported
• cites Sciolino et al., 2010 sourceSupported

Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

PRL performance depends on complex interactions between several component processes, including sensitivity to positive and negative feedback, response persistence, and exploration versus exploitation, each requiring functional activity in distinct PFC regions and brain regions outside the PFC.

“PRL performance depends on complex interactions between several component processes, including the sensitivity to positive and negative feedback, response persistence and exploration versus exploitation, each of which requires functional activity in distinct PFC regions (Verharen et al., 2018(Verharen et al., , 2020)), as well as brain regions outside the PFC (Izquierdo et al., 2017).”

• cites Verharen et al., 2018 sourcePartly supported

  Split into 2 atoms — 0 confirmed, 1 partially supported, 0 disputed, 0 misattributed, 1 unverifiable. Expand the claim to see per-atom verdicts.

  Experimental — accuracy not yet measured
• cites Verharen et al., 2020 sourcePartly supported

  Split into 2 atoms — 0 confirmed, 2 partially supported, 0 disputed, 0 misattributed, 0 unverifiable. Expand the claim to see per-atom verdicts.

  Experimental — accuracy not yet measured
• cites Izquierdo et al., 2017 sourceSupported

Probably not a substantial claim: may not pass S3 (load-bearing).

Previous observations in sensory cortex show a reduction in inhibition after sensory deprivation.

“in line with previous observations in sensory cortex showing a reduction in inhibition after sensory deprivation”

• cites Hensch et al., 1998 sourceCould not verify

  The main text (Fig. 1) reports reduced GABA release in GAD65-deficient mice, while the monocular-deprivation results (Fig. 3) report changes in eye responsiveness. Neither passage reports that sensory deprivation itself reduces inhibition in sensory cortex. Searches for reduced inhibition after deprivation found no such observation in our copy. (LLM, conf=0.78)

  Experimental — accuracy not yet measured
• cites Morales et al., 2002 sourceNot checked — no full text of the source
• cites Chattopadhyaya et al., 2004 sourceSupported

Probably not a substantial claim: may not pass S3 (load-bearing).

Play is not displayed continuously by young rats, but appears in peaks of relatively short duration across the day.

“Play is not displayed continuously by young rats, but appears in peaks of relatively short duration across the day (Melotti et al., 2014;Lampe et al., 2019).”

• cites Melotti et al., 2014 sourcePartly supported

  In “Relationships Between Home Cage Social Play and Other Play Contexts” (page not provided), the paper reports that 93.7% of the social play observed during the first hour of darkness occurred in its first 30 minutes. This supports a brief concentration of play rather than continuous play during that observation period, but the study did not observe play across the day or establish multiple daily peaks. (LLM, conf=0.86)

  Experimental — accuracy not yet measured
• cites Lampe et al., 2019 sourcePartly supported

  The Methods section (‘Home cage play observations’) says pilot observations found short play peaks interspersed across the first four hours of the dark phase. This supports intermittent, short-duration play, but not the claim that peaks occur across the day as a whole. (LLM, conf=0.86)

  Experimental — accuracy not yet measured

May combine two claims.

Rats in the SPD and CTL groups readily acquired the PRL task and achieved a comparable performance level in terms of rewards obtained.

“Rats in the SPD and CTL groups readily acquired the task and achieved a comparable performance level in terms of rewards obtained (Fig. 5C).”

May combine two claims.

SPD1h rats' performance in reversal completion resembled the SPD group during initial sessions but was closer to the control group in later sessions.

“the SPD1h rats resembled the SPD group during the initial sessions, but performed closer to the control group in later sessions (Fig. 7B)”

Probably not a substantial claim: may not pass S3 (load-bearing).

In all groups, Q learning models were generally better than heuristic win-stay models at describing behavioral choices.

“Although in all groups Q learning models (models 5-8) were generally better than the heuristic win-stay models (models 2 and 3) to describe behavioral choices”

Probably not a substantial claim: may not pass S3 (load-bearing).

When data from both batches were pooled, the difference between SPD and SPD1h groups was even clearer.

“This difference between SPD and SPD1h group was even clearer when we pooled the data from both batches (Fig. 7E,F).”

The quote only partly states this claim.

The SPD group had a clear reduction in mIPSC frequency compared with CTL rats, about 30%.

“a clear reduction in mIPSC frequency was found in the SPD group compared with CTL rats (Fig. 9B).”

• Also stated in: § Discussion · plain

  “We found a ;30% reduction in mIPSC frequency”

Probably not a substantial claim: may not pass S3 (load-bearing).

Puncta size is not much affected in SPD tissue.

“Puncta size was not much affected, although synaptic CB1-R puncta were slightly larger in SPD tissue (Fig. 4E).”

May combine two claims.

The SPD1h win-stay curve resembled the SPD curve in some earlier sessions but remained closer to the CTL curve toward later sessions.

“The SPD1h curve resembled the SPD curve in some of the earlier sessions, but then remained closer to the CTL curve toward the later sessions.”

May combine two claims.

SPD1h rats made ~200 pins and ~300 pounces per hour.

“SPD1h rats made ;200 pins and ;300 pounces per hour, which was comparable to rats in other studies that were isolated for 24 h (Niesink and Van Ree, 1989;Vanderschuren et al., 1995aVanderschuren et al., , b, 2008;;Achterberg et al., 2016).”

May combine two claims.

Rats of all three groups learned the PRL task equally well and gained similar numbers of rewards.

“Rats of all three groups learned the task equally well and gained similar numbers of rewards (Fig. 7A).”

Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

In the second batch, SPD rats tended to complete more reversals per session than CTL rats, but this difference did not reach statistical significance.

“Consistent with our earlier results (Fig. 5D), SPD rats tended to complete more reversals per session than CTL rats (Fig. 7B), but this difference did not reach statistical significance.”

Probably not a substantial claim: may not pass S3 (load-bearing).

Synaptic CB1-R puncta are slightly larger in SPD tissue.

“Puncta size was not much affected, although synaptic CB1-R puncta were slightly larger in SPD tissue (Fig. 4E).”

Probably not a substantial claim: may not pass S3 (load-bearing).

Synaptic density is not correlated with cell size.

“We verified that somata of L5 pyramidal cells had similar size in SPD and CTL tissue (Fig. 4F) and synaptic density was not correlated with cell size (Fig. 4G).”

Classified as probably not a substantial claim.

The PFC is important for neural operations required during social interactions.

“The PFC is important for higher cognitive, so-called executive functions (Miller and Cohen, 2001;Floresco et al., 2008), as well as neural operations required during social interactions (Frith and Frith, 2012;Rilling and Sanfey, 2011).”

• cites Frith and Frith, 2012 sourceNot checked — no full text of the source
• cites Rilling and Sanfey, 2011 sourceNot checked — no full text of the source

Classified as probably not a substantial claim.

The PFC is important for higher cognitive executive functions.

“The PFC is important for higher cognitive, so-called executive functions (Miller and Cohen, 2001;Floresco et al., 2008), as well as neural operations required during social interactions (Frith and Frith, 2012;Rilling and Sanfey, 2011).”

• cites Miller and Cohen, 2001 sourceNot checked — no full text of the source
• cites Floresco et al., 2008 sourceNot checked — no full text of the source

May combine two claims.

SPD rats, with or without daily playtimes, switched from a learning-based strategy to a more perseverative strategy, whereas CTL rats continued learning throughout training.

“Thus, SPD rats, with or without daily playtimes, switched from a learning-based strategy to a more perseverative strategy, whereas CTL rats continued learning throughout training.”

• Also stated in: § Discussion · plain

  “In this study, we observed that adult rats which had experienced SPD displayed a different behavioral strategy in the PRL task compared with CTL animals.”

Classified as probably not a substantial claim.

L5 pyramidal cells are the main output neurons of the PFC.

“We chose to study L5 cells, because these are the main output neurons of the PFC (Douglas and Martin, 2004).”

• cites Douglas and Martin, 2004 sourceNot checked — no full text of the source

Classified as probably not a substantial claim.

Behavioral performance after social isolation can be partially rescued by allowing the rats daily play for a short amount of time.

“Early behavioral studies have shown that behavioral performance after social isolation can be partially rescued by allowing the rats daily play for a short amount of time (Einon et al., 1978;Potegal and Einon, 1989).”

• cites Einon et al., 1978 sourceNot checked — no full text of the source
• cites Potegal and Einon, 1989 sourceNot checked — no full text of the source

May combine two claims.

Daily playtimes during the play deprivation period did not affect the development of PFC inhibition and failed to rescue the reduction in PFC GABAergic synapses.

“indicating that daily playtimes during the play deprivation period did not affect the development of PFC inhibition (Fig. 9B).”

• Also stated in: § Results · plain

  “The inclusion of daily play sessions during the SPD period failed to rescue the reduction in PFC GABAergic synapses”

• Also stated in: § Discussion · plain

  “We observed that 1 h of daily playtime during the deprivation period could not rescue the reduction in prefrontal IPSCs”

Classified as probably not a substantial claim.

We verified that our conclusions were supported by each batch separately.

“We verified that our conclusions were supported by each batch separately.”

Probably not a substantial claim: may not pass S3 (load-bearing).

Detected currents were manually inspected to exclude false events.

“The detected currents were manually inspected to exclude false events.”

Probably not a substantial claim: may not pass S3 (load-bearing).

The investigator was blinded to the groups of the sections when acquiring the images and performing the quantifications.

“The investigator was blinded to the groups of the sections when acquiring the images and performing the quantifications.”

Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

Series resistance was constantly monitored, and cells were rejected from analysis if series resistance changed by >20% or exceeded 30 MΩ.

“Series resistance was constantly monitored, and the cells were rejected from analysis if the series resistance changed by .20% or exceeded 30 MX.”

May combine two claims.

In the electrophysiology and immunocytochemistry datasets, the variance between cells or ROIs within slices was larger than the variance between slices, indicating that individual cells and ROIs can be treated as independent measurements.

“In the electrophysiology and immunocytochemistry datasets the variance between cells or regions of interest (ROIs) within slices was larger than the variance between slices, indicating that individual cells and ROIs can be treated as independent measurements.”

Probably not a substantial claim: may not pass S3 (load-bearing).

Pinning and pouncing are the most characteristic parameters of social play behavior in rats.

“Of these behaviors, pinning and pouncing are considered the most characteristic parameters of social play behavior in rats (Panksepp and Beatty, 1980;Vanderschuren et al., 1995b).”

• cites Panksepp and Beatty, 1980 sourceNot checked — no full text of the source
• cites Vanderschuren et al., 1995bNot matched

  Couldn’t be matched to a paper in Crossref, so it can’t be checked.

May combine two claims.

SPD results in a decrease in inhibitory synaptic input to L5 pyramidal cells in the adult PFC, with differential effects on perisomatic PV and CB1-R synapses.

“Together, these data show that SPD results in a decrease in inhibitory synaptic input to L5 pyramidal cells in the adult PFC, with differential effects on perisomatic PV and CB1-R synapses.”

May combine two claims.

Unrestricted juvenile social play is crucial to instruct the development of specific inhibitory connections in the PFC and to shape adaptive cognitive strategies in the adult brain.

“Our data therefore suggest that the experience of unrestricted juvenile social play is crucial to instruct the development of specific inhibitory connections in the PFC and to shape adaptive cognitive strategies in the adult brain.”

May combine two claims.

Social play behavior is of critical importance for the development of PFC circuitry and function, and PFC-dependent cognitive processes.

“Our data demonstrate that social play behavior is of critical importance for the development of PFC circuitry and function, and PFC-dependent cognitive processes.”

May combine two claims.

Juvenile social play has a key role in the development of perisomatic inhibition in the PFC and PFC-dependent cognitive flexibility.

“Together, our results demonstrate a key role for juvenile social play in the development of perisomatic inhibition in the PFC and PFC-dependent cognitive flexibility.”

Probably not a substantial claim: may not pass S2 (checkable), S3 (load-bearing).

The simplified strategy may be preferred under certain conditions, especially if it does not lead to a reduction in reward.

“and may therefore be preferred under certain conditions, especially if this does not lead to a reduction in reward.”