A comparison of generalization functions and frame of reference effects in different training paradigms

Six experiments were carried out to compare go/no-go and choice paradigms for studying the effects of intradimensional discrimination training on subsequent measures of stimulus generalization in human subjects. Specifically, the purpose was to compare the two paradigms as means of investigating generalization gradient forms and frame of reference effects. In Experiment 1, the stimulus dimension was visual intensity (brightness); in Experiment 2, it was line orientation (line-angle stimuli). After learning to respond (or to respond “right”) to stimulus value (SV) 4 and not to respond (or to respond “left”) to SV2 (in Experiment 1) or SV1 (in Experiment 2), the subjects were tested for generalization (recognition) with an asymmetrical set of values ranging from SV1 to SV11. Go/no-go training produced peaked gradients, whereas choice training produced sigmoid gradients. The asymmetrical testing resulted in a gradual shift of the peak of responding (go/no-go group) or in the point of subjective indifference (PSI; choice group) toward. the central value of the test series; thus, both paradigms revealed a frame of reference effect. The results were comparable for the quantitative (intensity) and the qualitative (line-angle) stimulus dimensions. Experiment 3 compared the go/no-go procedure with a yes/no procedure in which subjects responded “right” to SV4 and “left” to all other intensities and found no differences between these procedures. Thus the difference in gradient forms in go/no as opposed to (traditional) choice paradigms depends on whether one or two target stimuli are used in training. In Experiment 4, in which visual intensity was used, the shift in the PSI following choice training varied positively with the range of asymmetrical test stimuli employed. In Experiment 5, also with visual intensity, the magnitude of the peak shift following go/no-go training varied as a function of over representing a high or a low stimulus value during generalization testing. Experiment 6, with line angles, showed that the PSI following choice training varies in a similar way. The frame of reference effects obtained in these experiments are consistent with an adaptation-level model.     

Speed analyses of stimulus equivalence.

The functional substitutability of stimuli in equivalence classes was examined through analyses of the speed of college students'' accurate responding. After training subjects to respond to 18 conditional relations, subjects'' accuracy and speed of accurate responding were compared across trial types (baseline, symmetry, transitivity, and combined transitivity and symmetry) and nodal distance (one- through five-node transitive and combined transitive and symmetric relations). Differences in accuracy across nodal distance and trial type were significant only on the first tests of equivalence, whereas differences in speed were significant even after extended testing. Response speed was inversely related to the number of nodes on which the tested relations were based. Significant differences in response speed were also found across trial types, except between transitivity and combined trials. To determine the generality of these comparisons, three groups of subjects were included: An instructed group was given an instruction that specified the interchangeability of stimuli related through training; a queried group was queried about the basis for test-trial responding: and a standard group was neither instructed nor queried. There were no significant differences among groups. These results suggest the use of response speed and response accuracy to measure the strength of matching relations.     

Attitudes toward handicapped peers of mainstreamed and nonmainstreamed children in physical education

The influence of contact (mainstreamed and nonmainstreamed) and sex on attitudes of fifth- and sixth-grade students toward handicapped children was examined. 143 mainstreamed students attended an integrated school, whereas 86 nonmainstreamed students had no handicapped children in their school. Mean responses to the Children's Attitudes Toward Handicapped Scale were subjected to a 2 x 2 analysis of variance which indicated no significant differences by contact or sex. Chi 2 analysis of individual items indicated some significant differences, favoring contact, on items "are fun" and "are interesting".     

Academic Careers of Gifted Women

As part of a larger study concerning academically gifted college women, gifted freshman women who graduated (723) were compared with those who did not graduate (526) on certain academic variables. Graduates took an average of 12.6 quarters to complete their degrees. Average length of attendance before departure for Nongraduates was 5.8 quarters. Graduation with honors was achieved by 51.9 per cent of the Graduates. Graduates and Nongraduates differed significantly in GPA (3.06 to 2.50), contact with the Counseling Bureau (43.6 to 30.9 per cent), and in major fields of study. More Graduates had Liberal Arts (CLA) “social science,” CLA “interdepartmental and double,” Education, and Home Economics majors. More Nongraduates had CLA “English, linguistics, and languages,” CLA “natural science and mathematics,” and Business Administration majors. These results are discussed in relation to findings of the larger study concerning personality characteristics and vocational interests of gifted women, and a follow-up study of the Nongraduates.