Two experiments show that response to explicit dimensions is not crucial to the change from easier nonreversal to easier reversal shifts during overlearning in grammar school children ages 7, 8, and 9. (WY)

Verbal pretraining aided both single-problem discrimination and learning-set performance, while single-problem mastery manipulations had no significant effect. These results support the theory of acquired distinctiveness of cues. (MH)

The study investigated the influence of a response delay requirement on the discrimination performance of three autistic adolescents. Results showed that the response delay condition produced higher levels of correct responding than the no reponse delay condition. Teachers rated the response delay procedure practical and effective in a classroom…

Found that preschool children can form abstract concepts of left and right which are not bound to the specific training context: children were able to generalize to new figures and to new spatial locations. The nature of the preschool child's left-right judgments is discussed. (Author/RH)

Suggests that in tasks requiring the spatial coding of visual information children's performance depends on the degree of congruence between alternative spatial reference axes. (Author/MP)

This study assessed the adequacy of Gewirtz's interpretation of vicarious reinforcement and examined the development of responsiveness to vicarious reinforcement in an experiment in which 98 children (21/2-5 years) performed a discrimination problem while being exposed to a model who was either rewarded or punished on each trial. (SB)

A series of five experiments explore the 7-month-old infant's ability to discriminate among photos of faces. The infant's tendency to choose visual targets for inspection provides evidence of discrimination and recognition. (Author/JH)

Two-year-olds discriminated two original training stimuli nearly perfectly, thereby showing that some form of controlling stimulus-response relation had been established. Most children's generalization gradients had little or no slope. Results are not consistent with earlier generalization data from young children. (RH)

A series of experiments indicated that by 1 year of age, infants' perceptual categories correspond to linguistically significant categories. Developmental change between 6 and 12 months shows that perceptual abilities of the 1-year-old are not arbitrary, do not reflect all the discriminatory capabilities of the infant, and are similar to phonemic…

Infants (n=34) were tested on a speech-sound discrimination-in-noise task using the visual reinforcement of infant speech discrimination procedure. An adult control group was also tested. The infant-adult difference in discrimination threshold in noise was 6.9 dB. Advantages of this adaptive threshold procedure and possible applications are noted.…

The present experiments examined the extent to which two possible sources of error affect healthy subjects' performance in a rule-shift task. All 115 participants first received a discrimination learning task, in which a pair of different visual stimuli was presented on each trial, one of which had to be identified as "correct." Each stimulus…