Eye Gaze in Autism Spectrum Disorder: A Review of Neural Evidence for the Eye Avoidance Hypothesis.

This review looked at why autistic people often avoid eye contact. Scientists have two main theories: either the brain doesn't recognize eyes as important, or the brain becomes overstimulated by eye contact. After reviewing research studies, the evidence suggests autistic people may avoid eye contact because it causes too much brain activity and feels overwhelming, not because they don't understand its importance.

This review examined neural evidence for two competing theories about reduced eye contact in autism spectrum disorder. The amygdala theory suggests eye avoidance results from underactive brain regions that fail to recognize eyes as important. In contrast, the eye avoidance hypothesis proposes that overactive amygdala responses cause people to actively avoid eye contact to reduce uncomfortable arousal. The review analyzed studies measuring brain activity in social regions while participants viewed faces.

Of eleven reviewed studies, eight supported the eye avoidance hypothesis, suggesting that reduced eye contact in autism may be an adaptive strategy to manage amygdala-related hyperarousal rather than a deficit in social attention.

These findings suggest interventions should focus on helping autistic individuals manage sensory overwhelm rather than forcing eye contact. Therapeutic approaches might emphasize alternative ways to demonstrate social engagement while respecting natural avoidance behaviors that serve a regulatory function.

The review does not report the total number of participants across studies, specific methodological details of included studies, or quality assessment criteria. The search strategy and inclusion/exclusion criteria are not described in the abstract.

Reduced eye contact early in life may play a role in the developmental pathways that culminate in a diagnosis of autism spectrum disorder. However, there are contradictory theories regarding the neural mechanisms involved. According to the amygdala theory of autism, reduced eye contact results from a hypoactive amygdala that fails to flag eyes as salient. However, the eye avoidance hypothesis proposes the opposite-that amygdala hyperactivity causes eye avoidance.

This review evaluated studies that measured the relationship between eye gaze and activity in the 'social brain' when viewing facial stimuli. Of the reviewed studies, eight of eleven supported the eye avoidance hypothesis. These results suggest eye avoidance may be used to reduce amygdala-related hyperarousal among people on the autism spectrum.