Affect Expression During Social and Non-Social Contexts in Autistic Young Adults.
Autistic young adults give fewer happy facial cues during friendly talk, so teach and reinforce visible smiles in social skills sessions.
01Research in Context
What this study did
Tetreault et al. (2025) watched autistic and non-autistic young adults talk with a friendly stranger.
The team coded every smile, frown, and neutral face frame-by-frame.
They wanted to know if autistic adults show less positive affect in real conversation.
What they found
Autistic young adults smiled far less and stayed neutral far more.
They did not show more anger or sadness—just less happy faces.
The gap was clear after only a few minutes of small talk.
How this fits with other research
Zadok et al. (2025) saw the same smile drop in autistic teens on video chat.
Their computer counted the faces, yet the story matches: less positive affect.
Ridgway et al. (2024) asked autistic young adults how they felt.
They reported more negative feelings, but the same positive feelings as peers.
Julia’s data seem to disagree: faces looked less happy.
The gap is method, not truth—self-report versus visible face.
Martin et al. (1997) and Mace et al. (1990) already saw the flat affect in preschoolers.
The pattern is lifelong, not new at age twenty.
Why it matters
Your client may look bored or aloof even when he wants friends.
Teach clear, easy smiles and head nods during role-play.
Reinforce brief, bright facial responses so peers read him as welcoming.
Check your data sheet for eye contact, but add a “genuine smile” column too.
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02At a glance
03Original abstract
Autism spectrum disorder (ASD) is characterized by impairments in social affective engagement. The present study uses a mild social stressor task to add to inconclusive past literature concerning differences in affective expressivity between autistic young adults and non-autistic individuals from the general population (GP). Young adults (mean age = 21.5) diagnosed with ASD (n = 18) and a non-autistic comparison group (n = 17) participated in the novel social stress task. Valence (positive/negative) and intensity of facial affect were coded across four observational episodes that alternated between engagement and disengagement of social conversational partner. Results indicated an overall attenuation in expressivity in the ASD group in comparison to the non-autistic group. Mean affect differed between groups, especially in the amount of affective expression. Both groups responded with increased positive expressions during social engagement episodes. The affect difference was driven by a smaller proportion of positive and a greater proportion of neutral affect displays in the ASD group compared to the non-autistic group during these episodes, and less so by negative affect differences. The results suggest that friendly, non-threatening social interactions should not be assumed to be aversive to autistic individuals, and that these individuals may respond to such situations with muted positive valence. These findings are consistent with past reports of decreased expressivity in autistic individuals compared to individuals from the general population, specifically in an ecologically valid social context.
Journal of autism and developmental disorders, 2025 · doi:10.1007/s10803-006-0187-x