Effects of educational and career exploration system on vocational maturity

An experimental group of 792 tenth graders spent from 1 to 17 hr (average 3 hr) on ECES, a computer-based educational and occupational exploration system.Gains on a test of vocational maturity administered at the beginning and end of the school year were compared with a control group of 1453 tenth graders, matched on relevant variables. ECES users showed larger gains than nonusers in (1) degree of planfulness and (2) knowledge and use of resources for career exploration, as measured by the Career Development Inventory, not in information about education, occupations and career decision making. Gains were related to amount of time spent on ECES but male-female differences were not exhibited.     

The statistical interaction of cerebral specialization and integration in the interpretation of dynamic brain images

Two constructs of brain function, namely cerebral specialization and integration, have been examined in the analysis of blood flow and metabolic function resulting from dynamic imaging procedures. The purpose of the current paper is to illustrate the interaction of these two constructs at the statistical level. Because of the statistical interaction, it is argued that the currently accepted statistical evidence for cerebral specialization is, in fact, partially a function of the degree of regional cerebral integration. Therefore, found asymmetries of flow or rate may be solely a function of cerebral integration. These points are discussed with respect to developing a better understanding of stimulus/brain/behavior relations.     

Developmental and reading ability differences in accessing information from semantic memory

A categorical judgment task was utilized to investigate the relationships between word recognition skills and reading achievement at several grade levels. In the first experiment skilled and unskilled readers from Grades 2, 4, and 6 made cognitive decisions about pairs of words using either graphemic, lexical, or semantic information. In Experiment 2 skilled, average, and unskilled readers from Grades 1, 3, and 5 made semantic decisions about word or picture pairs. The speed and accuracy of word encoding, lexical access, and semantic memory access processes varied as a function of reading ability. These results suggest that inefficient word recognition skills can contribute to reading deficiencies as can deficiencies in semantic memory organization.     

Variants of uncertainty

In contrast to formal theories of judgement and decision, which employ a single notion of probability, psychological analyses of responses to uncertainty reveal a wide variety of processes and experiences, which may follow different rules. Elementary forms of expectation and surprise in perception are reviewed. A phenomenological analysis is described, which distinguishes external attributions of uncertainty (disposition) from internal attributions of uncertainty (ignorance). Assessments of uncertainty can be made in different modes, by focusing on frequencies, propensities, the strength of arguments, or direct experiences of confidence. These variants of uncertainty are associated with different expressions in natural language; they are also suggestive of competing philosophical interpretations of probability.     

Duration discrimination is better with food access as the signal than with light as the signal

In Experiment 1 a go/no-go discrimination procedure was used to compare control of five pigeons' keypecking by food-access duration with control by light duration. Pecks to an illuminated key were reinforced with grain following 10-sec presentations of food access or houselight, but not after 5-sec presentations of either stimulus. Each subject discriminated food-access duration faster and to a greater degree than light duration. In four between-subject replications, pigeons discriminated food-access duration better than the duration of a localized light, the feeder light and a keylight, and with either water or food as reinforcement. In Experiment 2 control by durations of food access and light was compared using a conditional right-left choice procedure (two pigeons), and a delayed symbolic matching-to-sample procedure (six pigeons). Under both, choice accuracy again was higher on food-access trials. The results of Experiment 3, in which two pigeons received generalization trials with durations of food access and light that were intermediate to the training values, confirmed that responding was controlled by the duration dimension of both food access and light. The superior control by food access is consistent with previous evidence that food is an effective and memorable stimulus, possibly because of its biological importance. These results also provided empirical support for the commonly made assumption that stimuli differ in effectiveness. As well, the results show that the stimulus to be discriminated can play an important role in the accuracy of duration disciminations, a fact which has implications for the study of temporal discriminations in animals.     

Factors effecting nonreinforced imitation: the model as a source of information or social control

Three experiments were conducted with kindergarten, second-grade, and fourth-grade children (N = 208) which investigated whether modelling of unreinforced behavior exerts control over childrens' behavior by providing information concerning other types of behavior more likely to be reinforced or by creating social demands for imitation. After learning that reinforcement was available, children observed an adult model emit a reinforced response or an unreinforced response and then remain to monitor the child's subsequent behavior or leave the situation. Compared to a no-model control, all children except kindergarten girls emitted more reinforced responses after observing the model being reinforced. Only second-grade children, however, showed performance changes after observing the unreinforced model. Second-grade children also only performed what they learned when the unreinforced model was not present. Conclusions were that the unreinforced behavior of the model serves not only as a source of information but also as a cue for unreinforced imitation.     

The meaning of observed violence: Effects on arousal and aggressive behavior

Eighty male subjects were either attacked by a confederate or treated neutrally and then watched a violent movie. Subjects were told beforehand that the fighting in the movie was motivated by either desires for revenge, by professionalism, or by altruism. Other subjects were shown the film without comment. Relative to subjects in all other conditions, subjects who had been attacked and told that the fight was motivated by revenge subsequently (1) gave more intense shocks to the confederate, (2) rated themselves as less restrained in aggressing, and (3) manifested higher levels of blood pressure at the conclusion of the film. The results indicate that the meaning attched to observed violence may affect the aggression elicited by that violence in at least two ways: by lowering inhibitions against aggressing, and by raising arousal levels.     

The effects of delay and imagery training on the recall and recognition of object pairs

The present study represents a further investigation of an imagery training procedure previously developed by the authors (Yuille & Catchpole, 1973). Subjects given a brief training session in the use of an interacting imaginal mnemonic showed significantly higher performance than nontrained Ss on tests of immediate, delayed, and second learning set memory. While both recognition and recall were equally affected by the procedure, with recognition showing its usual superiority, the type of immediate memory test did not affect delayed recall. The findings are interpreted as supporting the preference of young children for visual coding.