[The type of higher nervous activity in twins].

Exmination of twelve pairs of monozygote (MT) and dizygote (DT) twins and their control groups revealed an identity of the higher nervous activity type and a high positive intrapair and group correlation of typological parameters in MT (0.42); a predominantly different typological classification and a lower correlation in DT (0.33); a low correlation in the control group No. 1 and mere traces of general positive correlation in group No. 2 (0.07) and No. 3. The data point to the considerable genetic dependence of the higher nervous activity type; they also serve as a verification of the method used.