When individuals engage in social interactions, they coordinate their nonverbal movements. Atypical movement coordi-nation may contribute to social difficulties in autism. Further, distinct gender differences have been found in autism: malesshow reduced socio-communicative behaviours relative to females. Here, we explored whether interpersonal movementcoordination differs between males and females with autism, compared to neurotypical (NT) adults. Thirteen adults withautism participated. Twenty-six NT controls are currently being tested. Participants complete a semi-structured interviewwhile being video-recorded. Coordination between participant and examiner is measured using a video-based movementanalysis. Females with autism demonstrated significantly greater movement coordination with their conversational partner,within a smaller range, than males. Given past findings, we expect that coordination differences between autistic and NTmales will be greater than between autistic and NT females. These preliminary results suggest that investigating movementcoordination during interaction may provide a tool for better understanding gender differences in ASD.

Everyday conversation is composed of a rapid exchange of turns between talkers as they communicate. The speedof these exchanges implies simultaneous perception and production of conversational cues relevant to turn-taking behavior.Natural face-to-face conversation involves a rich set of these social cues including visual information whose contribution toperception of turns has yet to be examined. Our studies investigated the influence of visual information in perceiving a turnexchange. We examined the time-course of the use of these visual cues during turn judgments. Results show that visualinformation is sufficient but not necessary for perceiving turn exchanges. Further, the temporal precision with which auditorycues influence turn perception is greater than that of visual information. We suggest that although auditory cues dominatethe perception of turn exchanges, reliance on the various sources of information is flexible and may follow highly sensitivetimelines.