The Value in Friendship

Why do we value friendship? No explanation that appeals to values external to friendship will be a satisfactory answer to this question.     

Selective reinforcement of schizophrenics' interview responses

In this experiment each of five examiners tested and interviewed four subjects in each of three conditions. The subjects were 60 male, hospitalized schizophrenics. The three conditions were the reinforcement, after an operant period, of “sick talk”, “healthy talk”, or plural nouns during a structured interview. Half the Welsh factor A and R scale items were administered before the interview, half after the interview. Significant differences were found among experimental conditions in terms of changes from operant to reinforced interview periods in percentage of “sick talk” emitted by subjects and changes from pre- to post-testing in terms of Welsh R scores. The correlation between these two measures of change was statistically significant. The results were discussed in terms of the different therapeutic strategies of neoanalytic and behaviour therapists.     

Locus of the effect of a distinguishing feature in a memory search task

Subjects memorized one to four 8- or 16-sided random forms in a memory search task. The positive set forms ("yes" response) differed in number of sides from the negative set forms ("no" response) for the different set (DS) group, but this distinguishing feature was not available to the same set (SS) group. Mean reaction time increased as a linear function of log(2) of the positive set size for both groups, but the increase was greater for the SS than the DS group, suggesting that memory search rather than an encoding stage of information processing was influenced by the availability of a distinguishing feature. In a transfer task which followed, new forms were introduced in which the positive and negative set forms differed in number of sides for both groups. In this task, the two groups did not differ in memory search, but in encoding. It was proposed that (a) availability of a distinguishing feature influences search time because the information specifying the number of sides of the set of memorized forms can be used to influence the speed with which individual forms are examined in memory; (b) previous experience with a distinguishing feature influences encoding because the DS group had learned to extract the information specifying the set of memorized forms (not the information specifying individual forms) more efficiently than the SS group.     

Describing the elephant: Structure and function in multivariate data

There is a unity underlying the diversity of models for the analysis of multivariate data. Essentially, they constitute a family models, most generally nonlinear, for structural/functional relations between variables drawn from a behavior domain.     

Effects of Group Training in Problem‐Solving Style on Future Problem‐Solving Performance

Seventy‐five participants from one suburban high school formed 21 teams with 3–4 members each for the Future Problem Solving Program International (FPSPI). Students were selected to participate in either the regular FPSPI or an enhanced FPSPI, where multiple group training activities grounded in problem‐solving style were incorporated into a 9‐week treatment period. An ANCOVA procedure was used to examine the difference in team responses to a creative problem‐solving scenario for members of each group, after accounting for initial differences in creative problem‐solving performance, years of experience in FPSPI, and creative thinking related to fluency, flexibility, and originality. The ANCOVA resulted in a significant difference in problem‐solving performance in favor of students in the treatment group (F(1, 57) = 8.21, p = .006, partial eta squared = .126, medium), while there were no significant differences in years of experience or creativity scores. This result led researchers to conclude that students in both groups had equivalent creative ability and that participation in the group activities emphasizing problem‐solving style significantly contributed to creative performance.