Cerebral lateralization in homosexual males: a preliminary EEG investigation

A preliminary investigation was conducted to determine whether hemispheric patterns of electrophysiological activation in male homosexuals differ from that of male and female heterosexuals. Electroencephalographic (EEG) activity was recorded over left and right cerebral hemispheric locations while subjects performed verbal and spatial cognitive tasks. Male homosexuals demonstrated different patterns of alpha power compared to heterosexual males and females during baseline recording. Different hemispheric patterns of alpha activity also were observed between homosexual and heterosexual males during affective judgments of both verbal and spatial stimuli, but not between homosexual males and heterosexual females. These results provide further evidence of biologically-mediated functional differences between homosexuals and heterosexuals.