“…Possibly influenced by Rosvo1d, Mirsky and Pribram (58) who showed in 1954 that male rhesus monkeys subjected to amygdaloid lesions lost their aggressive patterns of social dominance, and reports by Niemeyer (52) in 1958 and Sawa (59) in 1954 of diminished aggressivity in man following amygdaloid lesions, Narabayashi (49) in Tokyo was the first to report systematically on the amygdalotomies in man that he initiated in 1958 and published in 1963. Then he had a series of 60 cases, 39 of whom had been subjected to a unilateral operation and a decrease in emotional excitability, and aggressivity was found in 85 percent of the patients; two-thirds were epileptics and the follow-up varied between 3-48 months.…”