The analysis of WISC scores for 314 school-age twins and 221 of their siblings revealed high concordance of full-scale and verbal IQ for monozygotic twins. The IQ concordance for dizygotic twins, twin-sibling pairs, and sibling pairs were comparable to each other but significantly lower than that for monozygotic twins. (Author/JMB)

Forty-eight fourth- and fifth-grade boys and girls designated as low-, middle-, or high-anxious performed anagram tasks in the presence of an experimenter also working on anagrams. Results showed that high-anxious children had the lowest performance scores and exhibited substantially more off-task glancing than low- and middle-anxious children.…

Twelve child confederates (six male and six female) were trained to be responsive or unresponsive to 48 female college students. Adult women attended more to responsive children and gave more help to responsive than to unresponsive girls. The adults also rated the children as more attractive, likeable, and competent when the children behaved…

This study explored the relationships among children's performance on a simplified version of Kagan's Matching Familiar Figures (MFF) Test of conceptual tempo, their IQ, their performance on several measures of self-regulatory behavior, and their general activity level. Subjects were 55 preschool boys and girls. (Author/JMB)

The essays of 480 children from 6 to 14 years of age were content analyzed along 21 dimensions of friendship expectation. Results supported an invariant-sequence interpretation for the 11 dimensions which increased significantly with age. (Author/JMB)

A wide variety of linguistic parameters designed to reflect verbal productivity and grammatical complexity were analyzed for 12 handicapped and 8 nonhandicapped preschool children. (Author/JMB)

Piaget's notion that children's theoretical moral thought would evidence greater usage of intentionality toward self-oriented as opposed to other-oriented hypothetical situations was tested in 60 kindergartners and 60 first graders. (Author/JMB)

Administration of a placement task to 66 preschool and grade school children revealed that the concept of higher/lower was understood earlier than above/below, which in turn was understood earlier than rising/falling. Within each pair of terms, the one referring to upness was comprehended earlier. (Author/JMB)

A new model of the peer group influence process was proposed and tested using questionnaire responses from 41 naturally existing adolescent cliques representing males and females in grades 6 through 12. (Author/JMB)

Eight operationally defined "feminine" gestures were recorded for 48 elementary school aged boys and girls while they individually performed a standardized play task. Results showed a significant overall difference between the sexes with three specific gestures discriminating significantly between the sexes. (Author/JMB)

Children in grades 1, 3, and 5 were asked to decide whether selected contradictory sentences were true or false. The age at which children were first able to evaluate the false sentences correctly corresponded to the relative speed with which adults evaluated the sentences in a timed vertification task. (Author/JMB)

Verbal interactions of three 2-year-old boys attending a play group were analyzed from videotapes made approximately 8 months apart. During this period, rates of interaction increased significantly, speakers learned to select message content more appropriate to the listener, and participants learned to watch each other more often. (Author/JMB)

First- and third-grade lower-SES children learned perceptual and functional concepts with stimuli either high or low in imagery value. The results showed no differential imagery effects for the acquisition of functional concepts. When the concepts were perceptual in nature, the trends suggested high-imagery facilitation. (Author/JMB)

In a free-recall task, sixth graders were given instructions to rehearse aloud either actively or passively and were exposed to materials which differed in terms of the presumed salience of the list organization. Results showed that recall varied as a function of list organization under both types of rehearsal. (Author/JMB)