A general framework for the analysis of concept identification tasks

A general framework is presented for concept identification based on hypothesis-testing theory. It is a modification of the duoprocess theory presented by Chumbley (1972). It is shown how Markov models for various complex concept identification tasks may be derived from this framework and how such models may be analyzed by making use of probability generating functions. Two experiments are described. In experiment 1 three tasks were used: two simple tasks, where the subject either only had to select the relevant dimension in order to solve the problem or only had to learn a short list of paired-associates, and a more complex task, where both processes were needed to reach the solution. The results were in general favorable to the theory. Experiment 2 was designed to test the application of the theory to the four-choice concept problem. The predictions of the theory are compared to those of the subproblem learning theory of trabasso and Bower (1964), modified to include a ‘learning-on-errors’ assumption. The fit of the duoprocess theory was reasonably good and superior to that of the subproblem learning theory.     

Effects of question type and experimenter position on bilateral differences in electrodermal activity and conjugate lateral eye movements

28 dextral males participated in a within-subjects experiment which tasted for the effects of question type (verbal versus spatial) and experimenter-position (in front of or behind the subject) on direction of conjugate lateral eye movements (LEMs) and bilateral differences in skin conductance responses (SCRs). Question dependent asymmetries were observed for LEM direction but not for SCR magnitude. Experimenter-position had no significant effect. The results for LEM direction are consistent with the hypothesis linking eye movements to the left or right with activation of the cerebral hemisphere contralateral to the direction of gaze. The results for SCR magnitude, given certain assumptions, can be reconciled with a hemispheric model of contralateral excitatory control of that system.     

Developmental differences in cognitive mapping: Configurational knowledge of familiar large-scale environments

In order to investigate the development of cognitive mapping of familiar large-scale environments. First-, fifth-, and eighth-grade children were asked to make bearing and distance estimates to six targets from three sighting locations in their school. Correlations between estimated and actual bearings and distances were extremely high at all grade levels, indicating that (a) children at all grade levels could reliably make such estimates, and (b) route knowledge of even the youngest children was quite high. Bearing accuracy increased between first- and fifth-grade and showed little improvement thereafter. Increases in a measure of configurational accuracy were found between first- and fifth-grade and between fifth- and eighth-grade. Differential accuracy as a function of the demands of particular sighting locations was found only for the younger children.     

Film-facilitated arousal and prosocial behavior

The present investigation sought to test the applicability of the excitation transfer model (P. Tannenbaum & D. Zillmann. In L. Berkowitz, Ed., Advances in experimental social psychology, Vol. 8, New York: Academic Press 1975) to prosocial behavior. This model predicts that for individuals predisposed to act prosocially, arousal transferred from an unrelated source will facilitate such behavior. Two studies were conducted in which male college students, treated in either a positive or neutral manner and shown an arousing erotic or nonarousing control film, ostensibly rewarded and punished a confederate for performance on a memory task. Contrary to predictions, the first experiment found the arousing film increased reward regardless of treatment. In the second experiment, where the neutral treatment was given a more negative tone, the predicted interaction was found. Specifically, subjects treated in a positive manner and shown an arousing film were significantly more rewarding than were similarly treated subjects shown the nonarousing film. While type of film had no effect on neutral subjects' reward behavior, the arousing film did increase their punitive behavior. These results, coupled with physiological and self-report data, strongly support the excitation transfer model.     

Remembrance of places lasts: Proactive inhibition and patterns of choice in rat spatial memory

A series of experiments was carried out to evaluate the notion that rats given a sequence of massed daily trials on the radial maze reset working memory at the end of each trial by deleting its contents. Although curves presented by D. S. Olton [Scientific American, 1977, 236, 82–98; In S. H. Hulse, H. Fowler, & W. K. Honig (Eds.), Cognitive processes in animal behavior, Hillsdale, N.J.: Erlbaum, 1978] show that rats return to errorless performance at the beginning of each trial after the first, the fact that accuracy falls less rapidly over choices on Trial 1 than on subsequent trials suggests a proactive inhibition (PI) effect. In Experiment 1, Olton's findings were replicated, and a PI effect was observed on Days 1–2 of testing. On Days 3–5, overall accuracy improved significantly and was associated with the development of a strong tendency for rats to enter adjacent alleys, which became particularly marked on the final trials of a day's testing. In order to prevent rats from achieving accurate performance by using an adjacent alleys pattern, a procedure was used in Experiment 2 which involved initial forced random choices followed by a retention test consisting of free choices. Repeated daily trials with this procedure yielded a significant PI effect, which was more marked at a 60-sec delay than at a 0-sec delay. Experiments 3 and 4 showed this PI effect to be robust and resistant to manipulations designed to produce release from PI. Both the PI effect and a strong tendency found in Experiment 1 for animals to avoid on the initial choices of Trial n those alleys most recently entered on Trial n?1 argue that rats do not reset working memory between trials.     

Developmental changes in free recall: The interaction of task structure and age

Free-recall learning and organization were measured for 3rd, 7th, and 11th graders under conditions which varied the type and amount of task structure. Task structure for the input or list-presentation phase was manipulated by using a random, constant, or alphabetic item sequence across trials. Task structure for the output or recall phase was manipulated by providing standard instructions or instructions which suggested the possible use of an alphabetic ordering scheme. Recall performance and organization showed an interaction between age and both manipulations of task structure. The 3rd graders required the maximal amount of task structure (alphabetic order with alphabetic instructions) to demonstrate recall facilitation relative to the completely unstructured control condition. The 7th graders showed recall facilitation for intermediate and high levels of task structure, and the 11th graders showed recall facilitation for low, intermediate, and high levels of task structure. The results are related to current hypotheses about developmental changes in recall performance and their relationship to changes in the systematic use of organizational strategies.