Lack of mutual understanding between people with and without this condition is the subject of a “double” problem by Damian (10[1])Milton. Professor Richard Borcherds’s life with this condition is chronicled in a chapter of the book The Essential Difference, which argues that the systemizing quotient being much greater than its counterpart causes this condition. Both the “mind-blindness” and “extreme male brain” theories about this condition were developed by Simon Baron-Cohen. The RAADS-R test helps diagnose adults with this condition, which now encompasses childhood disintegrative disorder and a “syndrome” named for an Austrian pediatrician. For 10 points, name this disorder characterized by social impairment, which is commonly viewed as a “spectrum.” ■END■