Adaptive behavior in dynamic environments critically depends on the ability to learn rapidly and flexibly from the outcomes of prior choices. In social environments, facial expressions of emotion often serve as performance feedback and thereby guide declarative learning. Abundant evidence implicates beta-noradrenergic signaling in the modulatory…

The paper consists of a review of 24 studies on mental retardation published in two Soviet journals between 1970 and 1980. An introductory section focuses on the theoretical framework for mental retardation research in the Soviet Union with a differentiation between oligophrenics (who have organic brain damage) and the intellectually backward (or…