Choice times and Spence's discrimination learning theory

In two experiments, rats acquired brightness discriminations in a free-operant circular runway with two response alternatives. Both individual and group choice times revealed continuous changes that were not apparent in the discrete measure of choice. Two major assumptions of Spence's discrimination learning theory were confirmed: (a) learning is continuous, and (b) discriminative stimuli in simple discrimination tasks of both simultaneous and successive types are compounds with position elements as well as elements from the relevant visual dimension. The distinctive, consistent pattern of learning revealed by the choice-time measure suggests that position habits reflect a learning strategy in which the complex task is learned as a series of simpler ones.     

Mistreatment of an esteemed other as a consequence affecting dissonance reduction

Recent research has shown that aversive behavioral consequences affect the magnitude of dissonance reduction. The present experiment was conducted to help clarify the meaning of an aversive consequence. In previous research, an aversive event was manipulated by having a subject believe that a counterattitudinal speech he had delivered was successful in convincing one of the subject's colleagues. In the present study, it was argued that convincing a colleague is aversive only to the extent that the colleague is liked. This reasoning was tested in a 2 × 2 factorial experiment in which subjects delivered a counterattitudinal speech to a recipient whom either was or was not liked by the subject and either was or was not convinced by the subject's speech. It was predicted and found that the subject would evidence attitude change only in the condition in which the speech led to the aversive event of successfully convincing an esteemed other. The results were discussed in terms of refining the relationship between attitude discrepant behavior and attitude change.     

Does school desegregation change occupational goals of Negro males?

Instruments, designed to assess values which affect the motivation to work and aspiration levels, were administered to over 600 Negro male seniors in Texas high schools. Results indicate that the degree and duration of school desegregation these students have experienced, ranging from less than 1 to more than 5 years, have had little effect on work values and occupational aspirations.     

Systematic desensitization, relaxation-training and suggestion in the treatment of test anxiety.

In investigations that have examined the component procedures in traditional desensitization treatment, desensitization was more effective than relaxation-training alone in several studies (Freeling and Shemberg, 1970: Davison, 1968; Rachman, 1968). while these treatments were equally effective in other studies (Benjamin, Mark and Huson, 1972: Aponte and Aponte, 1971; Johnson and Sechrest, 1968). One possible determinant of these inconsistent findings may be the presence of uncontrolled differences in therapeutic suggestion due to the fact that desensitization treatment typically includes a specific ‘rationale’ that explains the expected course and outcome of treatment while comparable authoritative guidelines for providing the rationale for relaxation treatment are not available.The present study compared the relative effectiveness of desensitization and relaxation-training in the treatment of test anxiety under conditions in which suggestion concerning the nature and outcome of treatment were essentially the same for both procedures. To examine systematically the role of suggestion in the treatment of test anxiety, instructions that were high and low in suggestion were given. Treatment outcomes were assessed in terms of changes in measures of anxiety and in performance on objective ability tests. A no-treatment group controlled for the effects of using the same pre- and post-treatment measures.     

Emotional stimulation, defensive orientation, and hemispheric activation

Lateral eye movements (LEM) were measured for 32 right-handed subjects while responding to questions rated for verbal and visual-spatial cognitive content and for varying levels of emotionally stimulating content. The results indicated that eye movements were distributed to the right and left in response to verbal and spatial items, respectively, and that emotional content enhanced leftward responding. In addition, the defensive style of subjects, as measured by a defense mechanism inventory, interacted with the cognitive and affective dimensions of questions and was a determinant of LEM.     

Self-directed career exploration: A comparison of CHOICES and the Self-Directed Search

This study compared student satisfaction ratings for CHOICES, an interactive computer-based career guidance program, and the Self-Directed Search,a pencil-and-paper career planning guide. During the first testing session, subjects (N = 75) completed a biographical data sheet and were alternately assigned to either the CHOICES or the SDS treatment. Later, each subject completed the other treatment and two research instruments designed to assess their reactions to both treatments. Results indicated a user preference for CHOICES over the SDS, although both programs received positive ratings. The findings were discussed in terms of user reactions to career guidance programs and the selection of the most cost-effective treatment.     

The bias of an estimate of coupled slack in stochastic PERT networks

An earlier paper presented a method for using response times to construct a PERT network representing the mental activities in a task. A key role in this method is played by parameters called coupled slacks. The magnitudes of the coupled slacks are used to test the validity of a PERT model and to deduce aspects of the structure of the network. In a stochastic PERT network, the usual estimate of coupled slack based on the mean completion times can be biased. Distribution-free upper and lower bounds are derived for the bias, and it is shown that the bias approaches zero as the probability of relatively long prolongations increases. It is also shown that the expected value of the estimate of coupled slack between two activities is negative only if the two activities are in a Wheatstone bridge. Finally, an estimate of the increase in completion time due to prolonging an activity, given that the prolongation did in fact increase the completion time, is derived.     

Blowing in the wind: Perceiving structure in trees and bushes

When lights are mounted at the ends of the limbs of a tree and the surround darkened such that branches and trunk are not visible, viewers can nonetheless make systematic and precise judgments about the unseen structure of the tree through its motion. They seem to perform this task by picking up information about the relative arborization of the tree through the vector paths of the lights on the limbs. Theoretically speaking, the focus of this study is on the perception of second-order centers of moment; previous studies have focused on the perception of first-order centers. A second-order center in a tree-like structure is the location where limb meets trunk, and it is these that perceivers can infer from the dynamic display. The importance of this study is to demonstrate further that the study of centers of moment makes possible a detailed and differential study of event perception.