Researchers have discovered that the brains of males with autism have fewer neurons in the amygdala, a part of the brain involved in emotion and memory. The study is the first neuroanatomical study to quantify a key difference in the autistic amygdala (Journal of Neuroscience, July 19, 2006).
David Amaral, PhD, research director of the UC Davis M.I.N.D. Institute in Sacramento, CA, and former graduate student Cynthia Mills Schumann, PhD, counted and measured representative samples of neurons in the amygdala of nine postmortem brains of males who had autism and 10 postmortem brains of males who did not have autism.