1985'3, p.154
Bogoyavlenskaya D. . , Susokolova I. A.
A pilot psychogenetical study of intellectual activity

In order to prove a hypothesis about the structure of intellectual activity (IA) it has been decided to study the interplay between genetical and environmental factors in the development of inter-individual differences in IA. Employment of the most up-to-date analytical tool used in genetics - multidimensional genetical approach enabled the authors to estimate basic components of the phenotypical variance of features; results point to the predominantly environmental determination of IA.