Perhaps you mean Verbal IQ, as in one of the two main things measured in a Wechsler test. (Performance and Verbal IQs)
People with Asperger's syndrome typically display a large gap between Performance IQ and Verbal IQ. My Verbal IQ, for example, was in the highly gifted range on the WISC-III (140s), and my Performance IQ was only in the average range (high 80s). Neurotypical children and adults have more even results. I only took this test once when I was nine years old.
Sources: This video (Autism Europe): http://www.youtube.com/watch?v=nQMCGwFBrx8
Tony Attwood's book: The Complete Guide to Asperger's Syndrome.