The current issue of Autism reports on a recent study indicating that 12 month old children who were later diagnosed with autism, displayed significantly more spinning, rotating, and unusual visual exploration of objects (i.e. looking out of the corner of the eye) than the control group without autism. 

Reference:  Ozonoff, Sally, Macari, Suzanne, Young, Gregory S., Goldring, Stacy, Thompson, Meagan, Rogers, Sally J.

Atypical object exploration at 12 months of age is associated with autism in a prospective sample

Autism 2008 12: 457-472