Measuring the prediction of observed actions using an occlusion paradigm: Comparing autistic and non-autistic adults.
Autistic adults need an extra beat to register tiny action delays—build that beat into social skills drills.
01Research in Context
What this study did
Gowen et al. (2022) asked 30 autistic and 30 non-autistic adults to watch short videos of a hand moving a cup. Halfway through, the screen went black for half a second. When the picture returned, the hand was either still in sync with real time or slightly behind.
Participants pressed one key if the action stayed on time and another if it lagged. The task measured how quickly they could spot tiny timing errors in someone else's movement.
What they found
Autistic adults were a large share less accurate at catching the lag. The drop was biggest when the delay was only 100-150 ms—about the blink of an eye.
Non-autistic adults noticed these micro-delays almost every time; autistic adults missed roughly one in four.
How this fits with other research
Fajardo-Castro et al. (2025) extends the same story to kids. They showed autistic children videos of people lifting toys either gently or harshly. The kids were slower and less accurate at labeling the 'how' of the action—its vitality form—mirroring the adult timing lag.
Fernandes et al. (2022) used brain waves and found autistic adults also show delayed early attention spikes (P200) when judging intentions. Together, the three studies point to a small but steady social-timing gap that starts in childhood and persists into adulthood.
Green et al. (2020) looks contradictory at first: they report autistic adults stay variable even after lots of motor practice. In fact, both papers highlight the same planning hiccup—slow feedforward control—just in different tasks. Emma shows the lag when watching others; C shows it when moving themselves.
Why it matters
You probably give wait time after asking a question. Add a tiny bit more—about half a second—before prompting again during turn-taking games, video modeling, or role play. This small pause lets autistic learners process the subtle action timing they just saw, closing the micro-gap Emma caught in the lab.
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02At a glance
03Original abstract
Action prediction involves observing and predicting the actions of others and plays an important role in social cognition and interacting with others. It is thought to use simulation, whereby the observers use their own motor system to predict the observed actions. As individuals diagnosed with autism are characterized by difficulties understanding the actions of others and motor coordination issues, it is possible that action prediction ability is altered in this population. This study compared action prediction ability between 20 autistic and 22 non-autistic adults using an occlusion paradigm. Participants watched different videos of a female actor carrying out everyday actions. During each video, the action was transiently occluded by a gray rectangle for 1000 ms. During occlusions, the video was allowed to continue as normal or was moved forward (i.e., appearing to continue too far ahead) or moved backwards (i.e., appearing to continue too far behind). Participants were asked to indicate after each occlusion whether the action continued with the correct timing or was too far ahead/behind. Autistic individuals were less accurate than non-autistic individuals, particularly when the video was too far behind. A trend analysis suggested that autistic participants were more likely to judge too far behind occlusions as being in time. These preliminary results suggest that prediction ability may be altered in autistic adults, potentially due to slower simulation or a delayed onset of these processes. LAY SUMMARY: When we observe other people performing everyday actions, we use their movements to help us understand and predict what they are doing. In this study, we found that autistic compared to non-autistic adults were slightly less accurate at predicting other people's actions. These findings help to unpick the different ways that social understanding is affected in autism.
Autism research : official journal of the International Society for Autism Research, 2022 · doi:10.1080/10407413.2014.957969