Brief Report: Pupillometry, Visual Perception, and ASD Features in a Task-Switching Paradigm.

The team asked 42 college students to watch a screen. Pictures switched between big shapes and tiny details.

An eye camera tracked pupil size every millisecond. Students also filled out the AQ questionnaire.

No one had an autism diagnosis. The goal was to see if subtle eye changes match autism trait scores.

People with higher trait scores showed bigger pupil swings each time the picture flipped.

The change was small—about 0.1 mm—but the link was strong. Pupil size alone explained 20 % of trait variance.

Keintz et al. (2011) saw the same pattern with eye contact. Higher trait adults avoided returning gazes. Both studies flag atypical visual reacting without a diagnosis.

Root et al. (2017) looked at preschoolers with ASD and found slower pupil light reflex. That sounds opposite, but they tested a bright flash, not a task switch. Different method, different age, different result—no true clash.

Takahashi et al. (2013) also worked with neurotypical adults. High-trait viewers did not lose memory when pictures got busy. Together the three papers show higher traits predict quirky visual handling across tasks and ages.

You can spot subtle autism features in seconds with a handheld eye tracker. No labels, no language. Try running a quick global-local slide show during intake. Watch for large pupil jumps—they may guide you to clients who need visual supports or social narratives even before formal testing.