A SERIES OF RESEARCH PROGRAMS CONCERNED WITH THE EFFECTS OF SYSTEMATIC VARIATIONS OF CERTAIN CONDITIONS RELATED TO LEARNING HAS BEEN CONDUCTED. PROJECTS PREVIOUSLY REPORTED INCLUDED TWO INVESTIGATIONS OF REINFORCEMENT AND SUBJECT VARIABLES AND ONE ON THE STUDY OF PRACTICE AND SUBJECT VARIABLES. THE NATURE OF THE OVERALL PROGRAM WAS DISCUSSED IN…

A private corporation conducted a study for the United States Air Force in 1973, investigating the long term effects of drug use on general mental ability. The air force personnel selected for participation in the study were 3741 known drug users and 6772 controls. Subjects received requests to sign a form allowing their high schools to release…

The effects and interactions of 3 variables on concept learning and retention were investigated: (1) method of stimulus presentation; (2) learning process; and (3) intellectual ability. One hundred and forty-four (144) 4th graders were divided into 4 groups, each of which was further subdivided into high, middle, and low intellectual ability…

Three studies compared learning and problem-solving performances of normal and familially-retarded children on tasks differing in complexity, and one study investigated motivational-personality differences. Main purpose of the first three studies was to investigate the controversy between developmental and defect theorists in mental retardation.…

This study was conducted in an elementary school where the Wisconsin Design for Reading Skill Development had been implemented and developed for several years. Its aim was to determine what happened to individual children during reading instruction when the Design was being systematically used. A case history approach was used, and the school was…

A classification of natal influences is proposed with a model of their operation. Natal influences affect maternal capacity, maternal load, and maternal efficiency. Since maternal load is increased in twin pregnancy, results of twin studies must be generalized with caution. The method of co-twin control is exemplified by examination of a small…

The authors are emmersed in a comprehensive review of the literature on intellectual sex differences. This paper consists of the first progress report and the tentative hypotheses of the work completed so far. Discussion is initially concerned with verbal and spatial abilities. It is concluded that girls learn language earlier, and may continue to…

Trotman responds to two criticisms of her previous research (EJ 168 902) on racial differences in intelligence and achievement. She clarifies the conclusions criticized by Longstreth (TM 503 913) and criticizes the conclusions reached by Wolff (TM 503 914). (BH)

Self and peer evaluations and experimental measures of conformity were given to 107 adolescent private school boys. Student discipline records also indicated the number of demerits. The self-report measures and the demerits showed maximum conformity between the self-protective and conscientious ego stages as measured by the Sentence Completion…

This study used 126 young adult black and white male inmates to test the comparability of the Pauker and Statz and Mogul short forms with the standard Wechsler Adult Intelligence Scale (WAIS). The Pauker form was superior with this population. Findings should not be generalized to other ages, races, or to women. (Author/CP)

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

Compared the performance of 29 institutionalized cultural-familial mental retardates on Piagetian conservation tasks. Examined the effects of age, sex, and degree of retardation on conservation performance. (BD)

Racial and social class factors as a determinant of school achievement for minority group children are discussed with reference to the many empirical studies in this area. (Author/AM)

Normal infants were administered the Bayley Scales of Infant Development at 6 months and the Stanford-Binet Intelligence Scale at 3 years. At 6 months the quality of stimulation found in the early environment was measured. Results indicate that home environment may contribute to instability of performance on infant tests. (GO)

Administered the Hooper Visual Organization Test (VOT) to 54 elementary students referred for psychometric evaluation. Results showed no significant relationship between sex and VOT scores, but age and IQ were significant correlates. (JAC)