Examined effects of a click signaling arrival of a visual stimulus to be timed on temporal discrimination in 3-, 5-, and 8-year-olds. Found that in all groups, the proportion of long responses increased with the stimulus duration, although the steepness of functions increased with age. Stimulus duration was judged longer with than without the…

Three experiments compared infants' reactions to videos of normally responsive women varying in eye contact. Found that, relative to frontal faces, three-month olds smiled less at images averting head and eye (H&I), head alone (H), and closing eyes (ECL) but not at averting eyes (E). Five-month-olds smiled less at H&I, E, and ECL but not…

Research supported by Public Health Service Special Fellowship 15,590.

Supported by grant MH-13515-02 from the U. S. Public Health Service.

The interrelations between mental age (MA), IQ, and mediation were studied in 72 retardates in special classes. Subjects were selected to fall into sexually balanced groups of six in 12 MA-IQ categories (IQ 50-59, 60-69, 70-79, and 80-89; MA 4-0 to 5-11, 6-0 to 7-11, and 8-0 to 9-11). The apparatus alternately displayed two pairs of stimuli, and…

Spatial egocentrism and its relationships to discrimination ability and communicative egocentrism were investigated in a sample of 80 adult males from a single institutional setting. Significant effects of order of task presentation indicated that the experimental procedure influenced performance on the spatial and communicative egocentrism and…

Investigates to what extent discrimination learning through time delay of multistimulus, distinctive-feature prompts is a function of the inclusion and configuration of the S-prompt. Results of two experiments with children aged four and five indicate that most subjects did not learn the task assigned unless two distinctive-feature prompts were…

Two experiments examine the sorts of cues that might be available to facilitate children's ability to discriminate between memories for their own actions. Results suggest that the differences in discrimination performance demonstrate the importance of kinesthetic cues and visible consequences for children's memory discrimination. (Author/RWB)

Reports on two studies during which 6-, 8-, and 10-year-old children were interviewed about three different types of regularities or rules: social conventions, physical laws, and logical necessities. Shows that older children made more distinctions between social and nonsocial items than did younger children. (HOD)

Presolution reversal prevented or significantly retarded learning in kindergarten and first-grade children but did not hinder learning in fifth-grade children. (Authors)

Tests the hypothesis that, while the difference in rate of smiling to O degree v non-O degree orientations will diminish with increasing age with silent and/or unfamiliar faces, infants over 14 weeks of age should continue to discriminate between a talking familiar 0 degree face, and all other combinations of orientation, familiarity, and silent…

Two experiments investigated infants' sensitivity to amount of continuous quantity and to changes in amount of continuous quantity. Found that 6-month-olds looked significantly longer at a novel quantity than at the familiar quantity. Nine-month-olds looked significantly longer at an impossible event than at a possible event. Findings question…

To examine intra- and interhemispheric communication or the transfer of information within and between the cerebral hemispheres, 32 right-handed learning disabled children aged 8-10 years, 11-13 years, and 14-16 years were presented a tactile discrimination task. Fabrics of the same or different texture were presented to the same hand (uncrossed…

Preschool children's association of the correct name with a clearly identified graphic form during an alphabet naming process is examined in this study. Subjects were 139 children (ages 2, 3, 4, and 5 years) who were asked individually to identify 52 cards, each with a single upper or lower case letter printed on it. Analysis of data was based on…