Research has identified specific structural differences in the AS brain: **Cerebellum** (Dr. Eric Courchesne, UCSD): The cerebellum is smaller in AS brains than NT brains in certain areas. The cerebellum regulates balance, limb movement, speech, and sensory modulation — all functions frequently disturbed in AS. **White matter** (Dr. Just and colleagues): White matter abnormalities in AS brains — the "cabling" connecting grey matter computing areas. Anything interfering with this communication makes it difficult to solve broad intellectual problems or interpret complex social interactions. **Brain growth rate** (Dr. Couchesne): The rate of brain growth in AS during early childhood differs from NTs, potentially enabling early diagnosis through head circumference measurements in the first years of life. These structural findings explain the wide range of AS symptoms — from sensory problems and movement disorders to social cognition difficulties — as stemming from brain differences rather than behavioral choices. **Source:** Lovett, *Solutions for Adults with Asperger Syndrome*, Ch 5 (pp123-127) See also: [[Sensory Processing in AS]], [[Brain Underconnectivity Theory]]