Screening for Autism in 9-Month-Olds by Measuring Social Visual Engagement

Accuracy of eye-tracking assays at 9 months relative to ASD vs. non-ASD diagnosis at 24 months

Diagnostic performance measured by sensitivity, specificity, area under the receiver operating characteristic curve, positive predictive value, and negative predictive value of the eye-tracking-based assays when compared with clinical reference standard diagnostic outcome of ASD or non-ASD.

Accuracy of eye-tracking assays at 9 months relative to Affected (ASD or DD) vs. Unaffected status at 24 months.

Diagnostic performance measured by sensitivity, specificity, area under the receiver operating characteristic curve, positive predictive value, and negative predictive value of the eye-tracking-based assays when compared with clinical reference standard diagnostic outcome of Affected vs. Unaffected.

Measure the ability of eye-tracking assays at 9 months to predict dimensional levels of social disability at 18-26 months compared to the Autism Diagnostic Observation Schedule, 2nd Edition (ADOS-2)

Eye-tracking assays at 9 months will generate a social disability index; investigators will measure the correlation between that index and results on a standardized assessment by the ADOS-2 of autistic social disability conducted by expert clinicians at 18-26 months.

Measure the ability of eye-tracking assays at 9 months to predict dimensional levels of verbal ability at 18-26 months compared to the Mullen Scales of Early Learning

Eye-tracking assays at 9 months will generate verbal ability indices; investigators will measure the correlation between those indices and results from a standardized assessment of expressive and receptive language function (the Mullen Scales of Early Learning). Receptive Language and Expressive Language Scales of the Mullen Scales of Early Learning (standardized measures of language function). Each item within these scales is scored either from 0 to 5 points for certain items or as 0 (skill not demonstrated) or 1 (correct response) for others. Raw scores are calculated by summing item-level ratings from the basal to the ceiling item. These raw scores are converted to standardized T-scores for analysis and interpretation (range: approximately 20-80 T-score; mean = 50, SD = 10; higher scores = better performance). The MSEL also yields an Early Learning Composite (mean = 100, SD = 15; higher scores = better overall performance).

Measure the ability of eye-tracking assays at 9 months to predict dimensional levels of nonverbal cognitive ability at 18-26 months.

Eye-tracking assays at 9 months will generate nonverbal ability indices. Investigators will assess the correlation between those indices and results from the Visual Reception Scale of the Mullen Scales of Early Learning (a standardized measure of nonverbal cognitive function). Each item on the Visual Reception Scale is scored either from 0 to 5 points for certain items or as 0 (skill not demonstrated) or 1 (correct response) for others. Raw scores are calculated by summing item-level ratings from the basal to the ceiling item. These raw scores are converted to standardized T-scores for analysis and interpretation (range: approximately 20-80 T-score; mean = 50, SD = 10; higher scores = better performance).