Any omissions or errors are my own contributions. -SR S. Ozonoff, UC Davis MIND Institute Abstract: http://imfar.confex.com/imfar/2011/webprogram/Paper7878.html The study was a collaborative effort between UC Davis’s MIND Institute and the University of Colorado. We usually think of autism onset in terms of two categories: Autism symptoms that appear early in life, before 1st birthday, or A child who loses previously acquired skills after the first birthday Ozonoff’s study used home videos that were coded using objective methods to see when symptoms were first apparent, and how they unfolded over time. The study looked at two questions: Are two categories sufficient to describe onset? How do home video and parent reports correspond? For the home video method, parents gave the researchers all home video in which child appeared, from age 6 months through the second birthday. The researchers focused on four social/communication behaviors: Eye contact Social smiles Joint attention Language In…