Validation of the Movie for the Assessment of Social Cognition in Adolescents with ASD: Fixation Duration and Pupil Dilation as Predictors of Performance.

Müller et al. (2016) showed the Movie for the Assessment of Social Cognition (MASC) to teens with ASD and typical peers. While the kids watched, an eye-tracker recorded where they looked and how their pupils changed. The team then asked questions about the characters' thoughts and feelings to score social-cognition skill.

The goal was to see if eye-fixation time on eyes and pupil size could predict who would struggle with the social questions.

Teens with ASD scored lower on the MASC quiz. Those who looked at the actors' eyes for shorter bursts and showed smaller pupil jumps also got more answers wrong. The two eye signs together flagged poor social-cognition performance.

In plain words: less eye contact and flatter arousal during the film meant worse people-reading skills.

The finding lines up with a mountain of eye-tracking work. Ma et al. (2021) pooled 72 studies and confirmed that people with ASD look less at eyes across all ages and cultures. Polzer et al. (2022) and Pan et al. (2025) show the same pattern holds even in toddlers, proving the gaze gap starts early.

Hanley et al. (2015) used live conversation instead of a film and still saw less eye fixation in cognitively able students with ASD. The message is consistent: reduced eye interest is a stable ASD marker from preschool to college.

de Kuijper et al. (2014) created a Spanish version of the MASC and found it could separate youth with Asperger's from controls. Nico's 2016 study adds the next layer—eye metrics explain why some kids score low, giving clinicians a faster, objective red flag alongside the standard quiz.

You now have two quick signals to spot social-cognition trouble: short eye fixations and small pupil surges during the MASC. If you already use the film, turn on the eye-tracker for two minutes; if gaze time is low or pupils barely budge, plan extra social-skills lessons and peer practice. No tracker? Simply watch the client's eyes during the video—frequent looks away may hint at the same deficit and guide your next teaching targets.