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Autism Observation Scale For Infants (AOSI)

The Autism Observation Scale (AOSI; Bryson, McDermott, Rombough, Brian, & Zwaigenbaum, 2000) is a semi-structured, play-based measure designed to identify early signs of autism in high-risk infants (i.e., those who have an older sibling with autism).


The AOSI is intended for infants aged 6–18 months. Seven activities provide opportunities to observe behaviors in the following areas: visual tracking, disengagement of attention, orientation to name, reciprocal social smiling, differential response to facial emotion, social anticipation, and imitation. Currently, the AOSI is used as a research instrument. It is unpublished and is not commercially available.


Author (yr) Age Range (yrs) Method of Administration/Format Approx. Time to Administer Subscales
Autism Observation Scale for Infants (AOSI)** Bryson, McDermott, Rombough, Brian, & Zwaigenbaum (2000) 0.5-1.5

18-item direct observational measure. Seven activities administered in an interactive, play-based format. Yields indication of the presence or absence of skill in each of the areas assessed.

20 min.

Visual Tracking; Disengagement of Attention; Orientation to Name; Reciprocal Social Smiling; Differential Response to Facial Emotion; Social Anticipation; Imitation

Screening/Diagnosis: S

Availability: Bryson, S. E., McDermott, C., Rombough, V., Brian, J., & Zwaigenbaum, L. (2000). The autism observation scale for infants [unpublished scale]. Toronto, ON.


Author (yr) Sample Size Topic(s) Addressed Outcome
Bryson, Zwaigenbaum, McDermott, Rombough, & Brian (2008) 32,34,26 - Age Range: 0.5, 1, 1.5 years Interrater reliability Test-retest reliability

Good to Excellent at 6 (0.74), 12 (0.93), and 18 months (0.94) for total scores; Across ages = 0.92 (unweighted kappas)

Acceptable at 12 months (0.61) (intra-class correlations)

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