Paper based on this research was presented at the 1968 American Educational Research Association Meetings, Chicago, Illinois. Paper supported in part by a grant from the U.S. Office of Education.

To determine whether infants can form face expression categories, groups of infants 18 to 24 weeks old, along with those 30 weeks old, were habituated by the infant control procedure to photographs of four different female faces, each with an identical expression (happiness or surprise). Results are discussed in terms of age and sex differences.…

An investigation of the causal attributions of success and failure performances on various levels of task difficulty by 36 learning disabled and 36 nondisabled adolescents revealed that Ss' perceptions of the task difficulty levels were significant determinants of the two groups' differing causal attributions. (Author/CL)

The performance of children ages three through eight years on a series of class-inclusion problems was examined in two studies. Three patterns of performance were observed: three- and four-year-olds responded in an approximately haphazard pattern, five- and six-year-olds tended to be consistently wrong, and seven- and eight-year-olds showed a…

An anagram task administered to high and low test-anxious subjects under varied levels of external distraction showed a significant main effect of test anxiety for the "hard" anagrams which also interacted with the subjects' sex and distraction. The effects of increments of anxiety arousal produced by distraction are discussed.…

This article provides indices of typing difficulty of typical business writing. These indices are somewhat higher than those found in earlier studies and are much higher than the indices used in textbooks as representing normal difficulty. (SSH)

Three experiments investigated effects of attentional factors on children's learning set performance. Younger children's learning was differentially affected by two or more irrelevant dimensions. Practice improved performance for all ages. Results confirmed that irrelevant dimensions and within-problems exposure interact with age and amount of…

This chapter helps the general reader to understand the test equating issues associated with test disclosure. It also helps the testing practitioner to recognize situations in which equating is necessary, and to understand how to accomplish various kinds of equating. (Author/BW)

Whether hierarchical ordering among fraction identification problems reflects the replacement of simple rules by complex rules was investigated. Latent class techniques revealed that children applied rules that were adequate for simple problems but had to be replaced to solve more complex problems. (Author/GK)

The purpose of this research was to examine developmental changes in the knowledge about what variables affect performance on the incidental learning task. Kindergarteners, second graders, fifth graders, and college students indicated on a rating scale how many animals a hypothetical person would remember under easy and difficult levels of each…

Different indices for the internal consistency, reproducibility, or homogeneity of a test are based upon highly similar conceptual frameworks. Illustrations are presented to demonstrate how the maximum and minimum values of KR20 are influenced by test difficulty and the shape of the distribution of test scores. (Author/CTM)