Co-observer evaluations affected the imitation of older children when they were alone, but not that of younger children. (Author)

Study attempted to determine the viability of optimal level theory as it pertains to infant perceptual and cognitive development. (Authors)

Indicates that approval and disapproval affect the subject's motivational level (assessed by rate of responding) rather than his learning (assessed by acquisition measures). This study is based on a dissertation submitted in partial fulfillment for the Ph.D. degree at the University of Denver. (MH)

Higher levels of predicting the more frequent event were achieved with males than females; with the contingent than the noncontingent situation; and with adult males than boys in the noncontingent situation. Females were more likely to repeat an incorrect prediction. (MH)

Assessed the influence of mnemonic and attentional aids on children's double-alternation learning, in a prediction situation in which subject had to learn to produce two consecutive responses of the alternate types. (Author/AJ)

Provides portions of data from 23,000 enlisted men in terms of their recreational activities. (MB)

Questions concerning the effects of familiar and alien materials, age and culture, and the etiology of conservation are examined in number and continous quantity tasks assessing conservation in Yoruba children from traditional and educationally advantaged homes. (Author/AJ)