Positive and negative cue redundancy in multiple cue probability learning

In two separate experiments, 80 introductory psychology students completed a two-cue probability learning task in which cue intercorrelation was positive or negative and cue validities were positive or negative. Results indicated that Ss did not learn the negative validity tasks. In addition, there were no significant differences between groups in achievement due to cue intercorrelation within any one experiment. However, the positive redundancy groups were significantly more consistent in the employment of their decision strategy than the negative redundancy groups when cue validities were positive. The negative redundancy groups were superior to positive redundancy groups in matching; again, when cue validities were positive.     

Semantic memory: Complexity or connectivity?

The complexity hypothesis predicts that concept-feature verification times should be directly related to the number of features associated with a concept (the fan effect). Conversely, the connectivity hypothesis predicts that for interconnected semantic relationships, this verification time should be inversely related to the number of closely associated features (the reversed fan effect). In the present experiments, although the time required for episodic recognition memory decisions tended to be directly related to the number of features associated with a concept, semantic verification times were inversely related to the complexity of the concept. In addition, the concept's complexity was at least as good a predictor of performance in semantic tasks as was the strength of association between the concept and feature. Both of these results are interpreted in terms of the connectivity hypothesis.     

Hemisphere size asymmetry predicts relative verbal and nonverbal intelligence differently in the sexes: An MRI study of structure—Function relations

Hemispheric size asymmetry differences as assessed from MRIs of 39 healthy college students were correlated with prorated WAIS-R Verbal IQ minus Performance IQ and Vocabulary minus Block Design scores within subjects. In men, a relatively larger left hemisphere predicted better verbal than nonverbal ability, whereas in women a larger left hemisphere predicted relatively better nonverbal than verbal ability. The results were interpreted as providing evidence for sex differences in brain organization.     

Note: A statistical problem in testing invariance of movement using the phase plane model

Invariant positions on a phase plane of joint angular position and velocity have been proposed as a means by which interlimb coordination may be achieved. This note identifies a problem in the testing, using conventional statistics, of hypotheses derived using the phase plane model. A possible solution is proposed based on directional statistics. Conclusions regarding phase angle invariance, which are based on conventional statistics, must be viewed with some caution.     

Hierarchical organization as a determinant of sequential learning

Subjects learned a set of permutations of a base sequence of letters. A set of permutations either defined a hierarchical organization for the base sequence or did not. Sets that defined organizations led to more correct responses, and the pattern of interitem sequential dependencies revealed that subjects had learned the organization defined by a response set. Differences in learning could not be explained in terms of the frequency with which items occurred adjacently because that frequency was held constant for both organization-defining and organization-free response sets. The difficulty of learning a particular organization was related to the memory load induced by the organization, and those differences were more consistent with a model of sequential learning proposed by Johnson (1970) than they were with a model proposed by Estes (1972).     

The role of letters in word identification: A test of the pattern-unit model

Three experiments are reported in which subjects were asked to read short stories and search for either a word with a particular meaning or a word that began with a particular letter. The results of the experiments were consistent with prior data in demonstrating that subjects were able to make word-level decisions faster than they could make component-level decisions. In addition, the final experiment indicated that subjects were no faster at finding a specific predesignated target word than they were at finding a word that belonged to a predesignated target category. The results were interpreted as supporting a model of pattern perception that assumes that the cognitive encoding of a small pattern does not entail any analogous, but prior, encoding of its components. In addition, the final experiment might suggest that the word-level encoding contains a semantic component.     

The Effect of Client Demeanor Upon the Verbal Responses of School Counselors

In a study of counselor verbal behavior as a function of client stimulus input, a counseling paradigm was employed using 4 client-actors and 30 counselors. Independent variables were hostile or friendly client behavior, amount of counseling experience, counselor sex and client sex. The dependent variable of counselor verbal behavior was measured by a revision of the Bales Interaction Process Analysis Categories. Analysis of variance led to the finding that all of the independent variables had a statistically significant effect upon the counselors' verbal responses, but the number of response categories affected varied from 1 to 7 depending on the variable involved. Significant interaction effects were also found. From the data, it was concluded that client demeanor and client sex significantly influenced counselors' verbal responses, but counselor experience and counselor sex were relatively unimportant in their effect upon the counselors' behavior.