Role play with large language models.

As dialogue agents become increasingly human-like in their performance, we must develop effective ways to describe their behaviour in high-level terms without falling into the trap of anthropomorphism. Here we foreground the concept of role play. Casting dialogue-agent behaviour in terms of role play allows us to draw on familiar folk psychological terms, without ascribing human characteristics to language models that they in fact lack. Two important cases of dialogue-agent behaviour are addressed this way, namely, (apparent) deception and (apparent) self-awareness.

The effect of musical training and language background on vocal imitation of pitch in speech and song.

Vocal imitation plays a critical function in the development and use of both language and music. Previous studies have reported more accurate imitation for sung pitch than spoken pitch, which might be attributed to the structural differences in acoustic signals and/or the distinct mental representations of pitch patterns across speech and music. The current study investigates the interaction between bottom-up (i.e., acoustic structure) and top-down (i.e., participants' language and musical background) factors on pitch imitation by comparing speech and song imitation accuracy across four groups: English and Mandarin speakers with or without musical training. Participants imitated pitch sequences that were characteristic of either song or speech, derived from pitch patterns in English and Mandarin spoken sentences. Overall, song imitation was more accurate than speech imitation, and this advantage was larger for English than Mandarin pitch sequences, regardless of participants' musical and language experiences. This effect likely reflects the perceptual salience of linguistic tones in Mandarin relative to English speech. Music and language knowledge were associated with optimal imitation of different acoustic features. Musicians were more accurate in matching absolute pitch across syllables and musical notes compared to nonmusicians. By contrast, Mandarin speakers were more accurate at imitating fine-grained changes within and across pitch events compared to English speakers. These results suggest that different top-down factors (i.e., language and musical background) influence pitch imitation ability for different dimensions of bottom-up features (i.e., absolute pitch and relative pitch patterns). (PsycInfo Database Record (c) 2023 APA, all rights reserved).

A neural signature for combined action observation and motor imagery? An fNIRS study into prefrontal activation, automatic imitation, and self-other perceptions.

INTRODUCTION: Research indicates that both observed and imagined actions can be represented in the brain as two parallel sensorimotor representations. One proposal is that higher order cognitive processes would align these two hypothetical action simulations. METHODS: We investigated this hypothesis using an automatic imitation paradigm, with functional near-infrared spectroscopy recordings over the prefrontal cortex during different motor simulation states. On each trial, participants (n = 14) observed a picture of a rhythmical action (instructed action) followed by a distractor movie showing the same or different action. Participants then executed the instructed action. Distractor actions were manipulated to be fast or slow, and instructions were manipulated during distractor presentation: action observation (AO), combined action observation and motor imagery (AO+MI) and observe to imitate (intentional imitation). A pure motor imagery (MI) condition was also included. RESULTS: Kinematic analyses showed that although distractor speed effects were significant under all instructions (shorter mean cycle times in execution for fast compared to slow trials), this imitation bias was significantly stronger for combined AO+MI than both AO and MI, and stronger for intentional imitation than the other three automatic imitation conditions. In the left prefrontal cortex, cerebral oxygenation was significantly greater for combined AO+MI than all other instructions. Participants reported that their representation of the self overlapped with the observed model significantly more during AO+MI than AO. CONCLUSION: Left prefrontal activation may therefore be a neural signature of AO+MI, supporting attentional switching between concurrent representations of self (MI, top-down) and other (AO, bottom-up) to increase imitation and perceived closeness.

[Heat-sensitive moxibustion of different suspension moxibustion methods and imitation moxibustion apparatus on moxibustion sensation and clinical efficacy in knee osteoarthritis].

OBJECTIVE: To observe the moxibustion sensation and the clinical therapeutic effect of heat-sensitive moxibustion of two different suspension moxibustion methods and imitation moxibustion apparatus on mild to moderate knee osteoarthritis (KOA), and compare the therapeutic effect of different moxibustion methods. METHODS: A total of 90 patients with mild to moderate KOA were randomized into a hand-held group (30 cases, 1 case dropped off), an imitation moxibustion apparatus group (30 cases) and a moxibustion shelf group (30 cases, 1 case dropped off). Ashi point, Dubi (ST 35), Neixiyan (EX-LE 4), Yanglingquan (GB 34), Yinlingquan (SP 9), Liangqiu (ST 34) and Xuehai (SP 10) were selected as the frequent acupoint areas to explore and determine the heat-sensitive acupoints, after that, hand-held suspension moxibustion, suspension moxibustion with imitation moxibustion apparatus and suspension moxibustion with moxibustion shelf were adopted in the 3 groups respectively. The treatment was given once every 2 days, and totally 10-time treatment was required in the 3 groups. The moxibustion sensation (composition of moxibustion sensation, number of moxibustion sensation types in individuals and moxibustion sensation intensity) after each treatment, the visual analogue scale (VAS) score, the Lysholms knee function score and the depth of effusion and thickness of synovial hyperplasia of affected knee joint before and after treatment were observed, and the clinical therapeutic efficacy was compared in the 3 groups. RESULTS: The compositions of moxibustion sensation and numbers of moxibustion sensation types in individuals in the hand-held group and the moxibustion shelf group were richer, the moxibustion sensation intensity was higher than that in the imitation moxibustion apparatus group (P<0.01, P<0.05). After treatment, the VAS scores were decreased, the Lysholms knee function scores were increased compared before treatment in the 3 groups (P<0.01); the VAS score in the hand-held group was lower than the imitation moxibustion apparatus group (P<0.05), the Lysholms knee function scores in the hand-held group and the moxibustion shelf group were higher than the imitation moxibustion apparatus group (P<0.05). After treatment, the depth of effusion and thickness of synovial hyperplasia of affected knee joint were decreased compared before treatment in the 3 groups (P<0.01), and those in the hand-held group and the moxibustion shelf group were lower than the imitation moxibustion apparatus group (P<0.05). The cured and markedly effective rate in the hand-held group was 79.3% (23/29), which was better than 36.7% (11/30) in the imitation moxibuation apparatus group and 58.6% (17/29) in the moxibustion shelf group (P<0.01, P<0.05). CONCLUSION: Heat-sensitive moxibustion can effectively treat knee osteoarthritis, while the different suspension moxibustion methods have an influence on clinical therapeutic effect, hand-held suspension moxibustion has the best efficacy.

Heat-sensitive moxibustion of different suspension moxibustion methods and imitation moxibustion apparatus on moxibustion sensation and clinical efficacy in knee osteoarthritis / 中国针灸

OBJECTIVE@#To observe the moxibustion sensation and the clinical therapeutic effect of heat-sensitive moxibustion of two different suspension moxibustion methods and imitation moxibustion apparatus on mild to moderate knee osteoarthritis (KOA), and compare the therapeutic effect of different moxibustion methods.@*METHODS@#A total of 90 patients with mild to moderate KOA were randomized into a hand-held group (30 cases, 1 case dropped off), an imitation moxibustion apparatus group (30 cases) and a moxibustion shelf group (30 cases, 1 case dropped off). @*RESULTS@#The compositions of moxibustion sensation and numbers of moxibustion sensation types in individuals in the hand-held group and the moxibustion shelf group were richer, the moxibustion sensation intensity was higher than that in the imitation moxibustion apparatus group (@*CONCLUSION@#Heat-sensitive moxibustion can effectively treat knee osteoarthritis, while the different suspension moxibustion methods have an influence on clinical therapeutic effect, hand-held suspension moxibustion has the best efficacy.

Intuitive invention by summative imitation in children and adults.

Humanity's ability to conquer every corner of the planet rests on our inventiveness. But is this inventiveness best explained by individual problem-solving skills or by our species' exceptional social learning abilities? Using a tower-building task, we show that, on average, 3% of 4-6 year old children (n = 180) and adults (n = 192) independently combined tower pieces to produce the most optimal tower possible, confirming that preschool age children and adults alike are poor independent inventors. Yet, after observing one or more models generate tower elements separately, both children and adults reproduced the demonstrated elements and spontaneously combined them, producing a novel (unobserved) tower of optimal height, evidence of intuitive invention by summative imitation. These results challenge folk concepts of innovation and corroborate those from mathematical models showing that our species' inventiveness generally arise from social learning rather than individual insights. So, rather than being sui generis, human inventions are, broadly, communis generis.

Motor imagery during action observation enhances imitation of everyday rhythmical actions in children with and without developmental coordination disorder.

Children with developmental coordination disorder (DCD) exhibit deficits both in imitation and motor imagery (MI) compared to typically developing children. Combined action observation and motor imagery (AO + MI) instructions can however enhance automatic imitation in both groups. In the present study we investigated the effects of AO + MI instructions on intentional imitation in children both with (n = 13) and without DCD (n = 12). On each trial participants observed and/or imagined before executing a familiar rhythmical pantomime action. These target actions were either habitually fast (tooth brushing or window wiping) or habitually slow (paint brushing or face washing), in the vertical or horizontal plane. Within each habitual speed, the target action speed was subtly manipulated across trials (fast vs. slow). Instruction condition was manipulated across three blocks of 16 trials: (1) observe before imitating the target action; (2) observe then imagine the action before imitating; (3) observe while imagining the same action before imitating (AO + MI). Kinematic analyses revealed typically developing children imitated the observed cycle times significantly better than children with DCD. A main effect of instruction showed imitation improved for AO + MI compared to the other two instructions. Within-group analyses found a significant advantage in DCD for AO + MI compared to observe then imagine. In typically developing children, imitation was significantly enhanced for AO + MI compared to observe then imitate. Combined AO + MI instructions therefore represent a promising new approach to refining performance of everyday rhythmical actions in children both with and without DCD, with implications for movement therapy and sports training.

A Content Analysis and Comparison of Two Peaks of Newspaper Reporting During a Suicide Cluster to Examine Implications for Imitation, Suggestion, and Prevention.

Background: During 2007-2008, media attention focused on a cluster of youth suicides in the UK. There were two peaks (P1, P2) in the volume of newspaper reporting of the deaths. The number of possible suicides was greater than expected at the time of the first peak but not at the time of the second. Aims: To explore any differences in the content of the reporting peaks and to consider implications for imitation and prevention. Method: A content analysis of two peaks of newspaper reporting was conducted. Results: There were 204 articles in P1 (December 27, 2007 to February 19, 2008) and 157 in P2 (February 20, 2008 to March 15, 2008). Four main themes were identified: individual stories; possible causes; features of reporting of the cluster; and educating and informing the public. P1 articles more frequently contained: explicit details of method; photographs of the deceased, and contained more characterization of individuals. Limitations: The focus was on print media, future studies should incorporate online and social media content. Conclusion: The findings provide some support for the hypothesis of a process of suggestion initiated by sensationalist reporting in P1. This contributes to the evidence base of the role of the press in suicide imitation and prevention, highlighting the importance of care when reporting suicides.

Adding Acoustical to Visual Movement Patterns to Retest Whether Imitation Is Goal- or Pattern-Directed.

This study compared two different motor skill modeling presentations (with and without goal display) in visual and audio-visual conditions for learning a complex skill (basketball jump shot) to evaluate the importance of (a) audio information and (b) goal observation in motor performance kinematics. Specifically, we sought to understand whether the simultaneous presentation of auditory and visual patterns could usefully direct the learner's attention from goal to pattern stimuli. I selected 40 students (Mage = 20.47 years) who had no prior experience with the basketball jump shot or free throw and randomly assigned them into four groups: Pattern/Visual, Pattern/Audio-Visual, Pattern-Goal/Visual, and Pattern-Goal/Audio-Visual. Participants in the pattern-only groups watched only the skilled motor pattern, while those in the pattern-goal groups watched both the pattern and its outcome. Participants in the visual-only groups simply watched the visual pattern, while those in audio-visual groups saw and heard the pattern; we sonified the angular velocity of the skilled performer's elbow joint. Participants then performed in two conditions with and without balls. On all dependent variables, the participants' performance following the audio-visual presentations was better than when following the visual-only presentations. In addition, the participants' performance in pattern-only groups was better than in pattern-goal groups, but this improved pattern-only performance was far less extensive in the audio-visual than in the visual-only group. In sum, complex motor skill imitation was enhanced by an audio pattern of elbow angular velocity in support of generalist theories of imitation learning.

Dance and Parkinson's: A review and exploration of the role of cognitive representations of action.

Parkinson's disease (PD) is a neurodegenerative condition that causes both sensorimotor and non-motor impairments, and there is a clear need for non-medical approaches to improve quality of life. Dance is an increasingly popular activity among people with PD, which demonstrates potential therapeutic benefits. However, findings to date have been inconsistent, and little is known about the mechanisms underlying benefits of dance in PD. In this review, we provide an overview of research into dance for people with PD. The majority of quantitative evidence is in the sensorimotor domain, but cognitive, psychological and social effects have also been reported. We consider the role of cognitive representations of action within dance through observation, imitation and imagery, which may contribute to both sensorimotor and non-motor outcomes for people with PD. Moreover, we discuss how these processes may be enhanced through dance to provide further benefits in everyday life. Finally, we propose avenues for future research to increase understanding of action representation in dance for PD, which has the potential to inform practice and maximize benefits.

The topographical organization of motor processing: An ALE meta-analysis on six action domains and the relevance of Broca's region.

Action is a cover term used to refer to a large set of motor processes differing in domain specificities (e.g. execution or observation). Here we review neuroimaging evidence on action processing (N = 416; Subjects = 5912) using quantitative Activation Likelihood Estimation (ALE) and Meta-Analytic Connectivity Modeling (MACM) approaches to delineate the functional specificities of six domains: (1) Action Execution, (2) Action Imitation, (3) Motor Imagery, (4) Action Observation, (5) Motor Learning, (6) Motor Preparation. Our results show distinct functional patterns for the different domains with convergence in posterior BA44 (pBA44) for execution, imitation and imagery processing. The functional connectivity network seeding in the motor-based localized cluster of pBA44 differs from the connectivity network seeding in the (language-related) anterior BA44. The two networks implement distinct cognitive functions. We propose that the motor-related network encompassing pBA44 is recruited when processing movements requiring a mental representation of the action itself.

Creative Yoga Intervention Improves Motor and Imitation Skills of Children With Autism Spectrum Disorder.

BACKGROUND: There is growing evidence for motor impairments in children with autism spectrum disorder (ASD), including poor gross and fine motor performance, poor balance, and incoordination. However, there is limited evidence on the effects of motor interventions for this population. OBJECTIVE: In the present study, the effects of a physical therapy intervention using creative yoga on the motor and imitation skills of children with ASD were evaluated. DESIGN: This study had a pretest-posttest control group design. METHODS: Twenty-four children with ASD aged between 5 and 13 years received 8 weeks of a physical therapist-delivered yoga or academic intervention. Children were tested before and after the intervention using a standardized motor measure, the Bruininks-Oseretsky Test of Motor Performance-2nd Edition (BOT-2). The imitation skills of children using familiar training-specific actions (ie, poses for the yoga group and building actions for the academic group) were also assessed. RESULTS: After the intervention, children in the yoga group improved gross motor performance on the BOT-2 and displayed fewer imitation/praxis errors when copying training-specific yoga poses. In contrast, children in the academic group improved their fine motor performance on the BOT-2 and performed fewer imitation errors while completing the training-specific building actions. LIMITATIONS: The study limitations include small sample size and lack of long-term follow-up. CONCLUSIONS: Overall, creative interventions, such as yoga, are promising tools for enhancing the motor and imitation skills of children with ASD.

Pitch-specific contributions of auditory imagery and auditory memory in vocal pitch imitation.

Vocal imitation guides both music and language development. Despite the developmental significance of this behavior, a sizable minority of individuals are inaccurate at vocal pitch imitation. Although previous research suggested that inaccurate pitch imitation results from deficient sensorimotor associations between pitch perception and vocal motor planning, the cognitive processes involved in sensorimotor translation are not clearly defined. In the present research, we investigated the roles of basic cognitive processes in the vocal imitation of pitch, as well as the degree to which these processes rely on pitch-specific resources. In the present study, participants completed a battery of pitch and verbal tasks to measure pitch perception, pitch and verbal auditory imagery, pitch and verbal auditory short-term memory, and pitch imitation ability. Information on participants' music background was collected, as well. Pitch imagery, pitch short-term memory, pitch discrimination ability, and musical experience were unique predictors of pitch imitation ability. Furthermore, pitch imagery was a partial mediator of the relationship between pitch short-term memory and pitch imitation ability. These results indicate that vocal imitation recruits cognitive processes that rely on at least partially separate neural resources for pitch and verbal representations.

Vocal imitation of percussion sounds: On the perceptual similarity between imitations and imitated sounds.

Recent studies have demonstrated the effectiveness of the voice for communicating sonic ideas, and the accuracy with which it can be used to imitate acoustic instruments, synthesised sounds and environmental sounds. However, there has been little research on vocal imitation of percussion sounds, particularly concerning the perceptual similarity between imitations and the sounds being imitated. In the present study we address this by investigating how accurately musicians can vocally imitate percussion sounds, in terms of whether listeners consider the imitations 'more similar' to the imitated sounds than to other same-category sounds. In a vocal production task, 14 musicians imitated 30 drum sounds from five categories (cymbals, hats, kicks, snares, toms). Listeners were then asked to rate the similarity between the imitations and same-category drum sounds via web based listening test. We found that imitated sounds received the highest similarity ratings for 16 of the 30 sounds. The similarity between a given drum sound and its imitation was generally rated higher than for imitations of another same-category sound, however for some drum categories (snares and toms) certain sounds were consistently considered most similar to the imitations, irrespective of the sound being imitated. Finally, we apply an existing auditory image based measure for perceptual similarity between same-category drum sounds, to model the similarity ratings using linear mixed effect regression. The results indicate that this measure is a good predictor of perceptual similarity between imitations and imitated sounds, when compared to acoustic features containing only temporal or spectral features.

Do as I say - or as I do?! How 18- and 24-month-olds integrate words and actions to infer intentions in situations of match or mismatch.

Infants use behavioral and verbal cues to infer another person's action intention. However, it is still unclear how infants integrate these often co-occurring cues depending on the cues' coherence (i.e., the degree to which the cues provide coherent information about another's intention). This study investigated how 18- and 24-month-olds' (N = 88 per age group) action selection was influenced by varying the coherence of a model's verbal and behavioral cues. Using a between-subjects design, infants received six trials with different stimulus objects. In the conditions Congruent, Incongruent, and Failed-attempt, the model uttered a telic verb particle that was followed by a matching or contradicting goal-directed action demonstration, or by a non goal-directed slipping motion, respectively. In the condition Pseudo-word, a nonsense word was combined with a goal-directed action demonstration. Infants' action selection indicated an adherence to the verbal cue in Congruent, Incongruent, and Failed-attempt, and this was stronger in 24- than 18-month-olds. Additionally, in Incongruent and Failed-attempt, patterns of cue integration across the six trials varied in the two age groups. Regarding the behavioral cue, infants in Congruent and Pseudo-word preferentially followed this cue in both age groups, which also suggested a rather unspecific effect of the verbal cue in Congruent. Relatively longer first action-latencies in Incongruent and Failed-attempt implied that these types of coherence elicited higher cognitive demands than in Congruent and Pseudo-word. Results are discussed in light of infants' flexibility in using social cues, depending on the cue's coherence and on age-related social-cognitive differences.

Motor imagery during action observation enhances automatic imitation in children with and without developmental coordination disorder.

Developmental coordination disorder (DCD) is a neurodevelopmental condition characterized by uncoordinated movement relative to age. While action observation (AO) and motor imagery (MI) can both independently enhance movement skills in children, we report the first study to assess the effects of combined action observation and motor imagery (AO + MI) on automatic imitation in children aged 7-12 years both with DCD (n = 12) and without DCD (n = 12). On each trial, participants planned to execute an instructed rhythmical action (face washing or paint brushing). Before responding, participants observed a rhythmical distractor showing the same or a different action with a subtle speed manipulation across trials (fast vs. slow). Automatic imitation was quantified as an imitation bias in subsequent response cycle times. Across blocks of trials, participants engaged in AO, MI, or combined AO + MI during the distractor phase or intentionally imitated the distractor speeds. Although there were no between groups differences, combined AO + MI instructions produced a significantly greater imitation bias (115%) than both AO (109%) and MI (109%), with intentional imitation yielding the strongest effects overall (128%). Within groups analyses revealed a significant bias for AO and MI in both groups. Combined AO + MI effects were significantly greater than AO in typically developing children and were greater than both AO and MI in children with DCD. These results demonstrate a clear capacity for different forms of motor simulation in children both with and without DCD. Moreover, combined AO + MI instructions represent an advantageous method for training movements in children with different motor abilities compared with separate AO and MI instructions.

Hearing and orally mimicking different acoustic-semantic categories of natural sound engage distinct left hemisphere cortical regions.

Oral mimicry is thought to represent an essential process for the neurodevelopment of spoken language systems in infants, the evolution of language in hominins, and a process that could possibly aid recovery in stroke patients. Using functional magnetic resonance imaging (fMRI), we previously reported a divergence of auditory cortical pathways mediating perception of specific categories of natural sounds. However, it remained unclear if or how this fundamental sensory organization by the brain might relate to motor output, such as sound mimicry. Here, using fMRI, we revealed a dissociation of activated brain regions preferential for hearing with the intent to imitate and the oral mimicry of animal action sounds versus animal vocalizations as distinct acoustic-semantic categories. This functional dissociation may reflect components of a rudimentary cortical architecture that links systems for processing acoustic-semantic universals of natural sound with motor-related systems mediating oral mimicry at a category level. The observation of different brain regions involved in different aspects of oral mimicry may inform targeted therapies for rehabilitation of functional abilities after stroke.

Miming neurological syndromes improves medical student's long-term retention and delayed recall of neurology.

Basic examination and diagnostic skills in neurology are important for every graduating medical student. However, a majority of medical students consider neurology as complex and difficult to master. We evaluate the impact a learner-friendly, innovative simulation-based training programme has on long-term retention and delayed recall of neurological semiology amongst third-year medical students from the University Pierre et Marie Curie in Paris, France. The 2013 class received standard teaching in neurological semiology. The 2015 class who received the same standard teaching in neurological semiology were also invited to voluntarily participate in The Move, a mime-based role-play training programme of neurological semiology. During the Move, students were trained to simulate a patient with a neurological syndrome or the physician examining the patient. Students were evaluated with an assessment thirty months after their neurological rotation, including 15 questions to evaluate long-term retention of neurological semiology, and 10 to test background knowledge in general semiology. The semiology test was performed by 366/377 students from the 2013 class (standard education group) and by 272/391 students from the 2015 class, among which 186 participated in The Move (The Move group) and 86 did not (standard education group). The mean neurological semiology score was higher in the 2015 class compared to the 2013 class (p = 0.007) and remained so after adjustment for the general semiology performance (p = 0.003). The adjusted mean neurological semiology score was 1.21/15 points higher [95% CI 0.66, 1.75] in The Move group compared to the standard education group, corresponding to a 14% better ranking. The Move programme improves medical student's long-term retention and delayed recall of neurological semiology. This learner-friendly interactive teaching may in turn enhance clinical proficiency of future physicians in neurological semiology.

Synergistic effect of acupuncture and mirror therapy on post-stroke upper limb dysfunction: a study protocol for a randomized controlled trial.

BACKGROUND: Upper limb dysfunction is common after stroke, posing an important challenge for post-stroke rehabilitation. The clinical efficacy of acupuncture for the recovery of post-stroke upper limb function has been previously demonstrated. Mirror therapy (MT) has also been found to be effective. However, the effects of acupuncture and MT have not been systematically compared. This trial aims to elucidate the synergistic effects of acupuncture and MT on upper limb dysfunction after stroke. METHODS: A 2 × 2 factorial randomized controlled trial will be conducted at the rehabilitation hospitals affiliated with Fujian University of Traditional Chinese Medicine. A total of 136 eligible subjects will be randomly divided into acupuncture treatment (AT), MT, combined treatment, and control groups in a 1:1:1:1 ratio. All subjects will receive conventional treatment. The interventions will be performed 5 days per week for 4 weeks. AT, MT, and combined treatment will be performed for 30 min per day (combined treatment: AT 15 min + MT 15 min). The primary outcomes in this study will be the mean change in scores on both the FMA and WMFT from baseline to 4 weeks intervention and at 12 weeks follow-up between the two groups and within groups. The secondary outcomes are the mean change in the scores on the Visual Analogue Scale, Stroke Impact Scale, and modified Barthel index. Medical abstraction of adverse events will be assessed at each visit. DISCUSSION: The results of this trial will demonstrate the synergistic effect of acupuncture and MT on upper limb motor dysfunction after stroke. In addition, whether AT and MT, either combined or alone, are more effective than the conventional treatment in the management of post-stroke upper limb dysfunction will also be determined. TRIAL REGISTRATION: Chinese Clinical Trial Registry: ChiCTR-IOR-17011118 . Registered on April 11, 2017. Version number: 01.2016.09.1.

Speech Rate Entrainment in Children and Adults With and Without Autism Spectrum Disorder.

Purpose: Conversational entrainment, a phenomenon whereby people modify their behaviors to match their communication partner, has been evidenced as critical to successful conversation. It is plausible that deficits in entrainment contribute to the conversational breakdowns and social difficulties exhibited by people with autism spectrum disorder (ASD). This study examined speech rate entrainment in children and adult populations with and without ASD. Method: Sixty participants including typically developing children, children with ASD, typically developed adults, and adults with ASD participated in a quasi-conversational paradigm with a pseudoconfederate. The confederate's speech rate was digitally manipulated to create slow and fast speech rate conditions. Results: Typically developed adults entrained their speech rate in the quasi-conversational paradigm, using a faster rate during the fast speech rate conditions and a slower rate during the slow speech rate conditions. This entrainment pattern was not evident in adults with ASD or in children populations. Conclusion: Findings suggest that speech rate entrainment is a developmentally acquired skill and offers preliminary evidence of speech rate entrainment deficits in adults with ASD. Impairments in this area may contribute to the conversational breakdowns and social difficulties experienced by this population. Future work is needed to advance this area of inquiry.