Hitler: a neurohistorical formulation.

It is hypothesized that Adolf Hitler suffered from a constitutional left-side weakness that allowed his cerebral hemisphere to exert a strong influence on his thought and behavior. Physical characteristics such as trembling of the left extremities, lack of a left testicle, and tendency to exhibit leftward eye movements are interpreted as supportive of the hypothesis. Right hemisphere dominance is consistent with a number of Hitler's personal traits such as praise of the irrational, automatic speech, auditory hallucinations, hypochondriasis, uncontrolled rages, and spatial and musical interests. Right hemisphere dominated thought may also have formed a basis for his two basic political policies: Lebensraum and anti-Semitism.