Decomposing the autism phenotype into familial dimensions

The objective of this article is to decompose the level of functioning phenotype in autism to see if it can be conceptualized as two simpler, but still familial, dimensional phenotypes of language and non-verbal IQ. We assembled 80 sibpairs with either autism, Asperger syndrome or atypical autism. To see whether the familial correlation on language scores was accounted for by the familial correlation on non-verbal IQ, residual language scores …