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For the interpretation of these significant investigations, it should be remembered that reciprocal relations exist in the hypothalamus with respect to autonomic and somatic functions which are closely associated with the emotions.

The feeding-pain antagonism seems to be based on this reciprocal relation between the tropho- and ergotropic systems.

Furthermore, a functional antagonism exists between an aggressive attitude and a state of anxiety.

Although in both emotions sympathetic symptoms are present, different autonomic-somatic patterns underlie aggression and anxiety, respectively, as indicated by the rate of the excretion of the catecholamines, the state of the muscle tone, and the Mecholyl test.

The psychological incompatibility of these emotional states seems to be reflected in, or based on, this marked difference.