Oculomotor randomness is higher in autistic children and increases with the severity of symptoms.
More severe autism symptoms track with more random eye-movement patterns during movie watching—an easy-to-capture potential biomarker.
01Research in Context
What this study did
The team watched how autistic and typical kids moved their eyes while they watched a short movie. They used a camera to track every tiny jump the eyes made.
They turned the jumps into a "randomness score." Higher scores meant the eyes jumped in a less predictable pattern.
What they found
Kids with autism showed more random eye jumps than typical kids. The higher the randomness, the higher the child's ADOS severity score.
Randomness also dipped as age and thinking skills went up, giving a quick number that mirrors symptom load.
How this fits with other research
Caldani et al. (2020) saw the same children make extra "express" saccades during lab tasks. The two findings look opposite—extra jumps vs. random jumps—but they capture different moments: one during rule-based tasks, one during free movie watching. Together they show the same eyes can be both hasty and chaotic, depending on the context.
Gutierrez et al. (1998) first noticed that autistic kids fire too many saccades that ignore the picture. Ziv et al. (2024) now give that old idea a ruler: a single randomness number that rises with autism severity.
Zalla et al. (2018) found slower, wobblier saccades in high-functioning adults. The child randomness score may be the childhood root of the adult speed problem, tracing one oculomotor thread across the lifespan.
Why it matters
You can add a 30-second movie clip to your intake and get a severity-linked number before you even start formal testing. If randomness is high, pair your social-skills program with strategies that settle visual attention first—think brief preview screens or blocked visual clutter. Re-check the clip after a few months; dropping randomness may flag real progress even when ADOS words stay flat.
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02At a glance
03Original abstract
A variety of studies have suggested that at least some children with autism spectrum disorder (ASD) view the world differently. Differences in gaze patterns as measured by eye tracking have been demonstrated during visual exploration of images and natural viewing of movies with social content. Here we analyzed the temporal randomness of saccades and blinks during natural viewing of movies, inspired by a recent measure of "randomness" applied to micro-movements of the hand and head in ASD (Torres et al., 2013; Torres & Denisova, 2016). We analyzed a large eye-tracking dataset of 189 ASD and 41 typically developing (TD) children (1-11 years old) who watched three movie clips with social content, each repeated twice. We found that oculomotor measures of randomness, obtained from gamma parameters of inter-saccade intervals (ISI) and blink duration distributions, were significantly higher in the ASD group compared with the TD group and were correlated with the ADOS comparison score, reflecting increased "randomness" in more severe cases. Moreover, these measures of randomness decreased with age, as well as with higher cognitive scores in both groups and were consistent across repeated viewing of each movie clip. Highly "random" eye movements in ASD children could be associated with high "neural variability" or noise, poor sensory-motor control, or weak engagement with the movies. These findings could contribute to the future development of oculomotor biomarkers as part of an integrative diagnostic tool for ASD.
Autism research : official journal of the International Society for Autism Research, 2024 · doi:10.1002/aur.3083