Jones W, Carr K, Klin A
Absence of preferential looking to the eyes of approaching adults predicts level of social disability in 2-year-old toddlers with autism spectrum disorder. [Journal Article, Research Support, N.I.H., Extramural, Research Support, Non-U.S. Gov't]
Arch Gen Psychiatry 2008 Aug; 65(8):946-54.
CONTEXT: Within the first week of life, typical human newborns give preferential attention to the eyes of others. Similar findings in other species suggest that attention to the eyes is a highly conserved phylogenetic mechanism of social development. For children with autism, however, diminished and aberrant eye contact is a lifelong hallmark of disability.
OBJECTIVE: To quantify preferential attention to the eyes of others at what is presently the earliest point of diagnosis in autism.
DESIGN: We presented the children with 10 videos. Each video showed an actress looking directly into the camera, playing the role of caregiver, and engaging the viewer (playing pat-a-cake, peek-a-boo, etc). Children's visual fixation patterns were measured by eye tracking.
PARTICIPANTS: Fifteen 2-year-old children with autism were compared with 36 typically developing children and with 15 developmentally delayed but nonautistic children.
MAIN OUTCOME MEASURE: Preferential attention was measured as percentage of visual fixation time to 4 regions of interest: eyes, mouth, body, and object. Level of social disability was assessed by the Autism Diagnostic Observation Schedule.
RESULTS: Looking at the eyes of others was significantly decreased in 2-year-old children with autism (P < .001), while looking at mouths was increased (P < .01) in comparison with both control groups. The 2 control groups were not distinguishable on the basis of fixation patterns. In addition, fixation on eyes by the children with autism correlated with their level of social disability; less fixation on eyes predicted greater social disability (r = -0.669, P < .01).
CONCLUSIONS: Looking at the eyes of others is important in early social development and in social adaptation throughout one's life span. Our results indicate that in 2-year-old children with autism, this behavior is already derailed, suggesting critical consequences for development but also offering a potential biomarker for quantifying syndrome manifestation at this early age.
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