A factorial design was used with two anxiety groups (high and low), three reinforcement conditions (praise, reproof, and praise plus reproof), and three levels of intelligence (high, middle, low). Subjects were 252 students (mean age, 14.7 years). (Author/JH)

The relative effectiveness of two types of verbal reinforcement and one type of tangible reinforcement on a two-choice discrimination task was determined for middle and lower class male and female preschool children. It is suggested that consideration of baseline and IQ might have reconciled disparate findings of previous studies. (GO)

Two experiments were concerned with exploring the relative accessibility and availability of category information in retarded adolescents in comparison with CA equivalent nonretarded subjects. (Author/SB)

To clarify the roles of IQ and mental age (MA) in hypotheses behavior, MA-matched subjects at three levels of IQ and three levels of MA received blank trial discrimination learning problems using procedures designed to discourage position-oriented responding. (Author/BD)

Educable mentally retarded (EMR) and nonretarded (NR) adolescents verified superordinate and basic level descriptions of common objects. Results suggest that EMR subjects had difficulty making semantic classification decisions in general. Other results suggest that group differences in semantic processing speed were related to the deliberate…

The discriminative learning and transfer of compound and component problems were assessed in retarded subjects at two levels of intelligence. (Author/SB)

Results were interpreted as supporting an inhibition deficit theory of mental retardation. (Authors)