Effects of instructions and biofeedback on EEG-alpha production and the effects of EEG-alpha biofeedback training for controlling arousal in a subsequent stressful situation

In Phase One, 44 subjects participated in a 2 (instructions to increase alpha, no instructions to increase alpha) × 2 (alpha biofeedback, no alpha biofeedback) factorial experiment. Results indicated that increases in alpha production were due to instructions to increase alpha and that biofeedback had no effect on alpha production. In Phase Two, the 44 subjects from Phase One were exposed to a threat of shock whereas 11 additional subjects in a control condition were not. The design employed in Phase Two was a 2 (previous instructions and stress, no previous instructions and stress) × 2 (previous biofeedback and stress, no previous biofeedback and stress) plus 1 (no previous instructions/no previous biofeedback, no stress). Results indicated that the threat of shock was effective in increasing arousal (as measured by heart rate and skin resistance) but previous EEG-alpha biofeedback training was not effective in helping subjects decrease arousal while in the stressful situation. The results indicate that it is the instructions (and related information concerning alpha) rather than the biofeedback that is critical in alpha biofeedback training and that this training does not appear to have utility for controlling arousal under stress.     

Utilization of groups in training for school consultation

The purpose of the present paper is to describe the utilization of groups over the past six years in our two semester school consultation practicum course. In addition, problems and issues raised by the utilization of groups are considered. Three tensions resulting from the utilization of groups are described and it is concluded that regardless of the complexity of the issues or the instructor's fallibility, the three tensions represent issues around which instructors must make decisions.     

Free trees and bidirectional trees as representations of psychological distance

Two types of graph-theoretic representations of psychological distances or dissimilarities are proposed: weighted free trees and weighted bidirectional trees. A weighted free tree is a generalization of the sort of graph representation used in hierarchical clustering. A weighted bidirectional tree is a further generalization which allows for asymmetric dissimilarities. The properties of these structures are discussed and numerical methods are presented that can be used to derive a representation for any given set of dissimilarities. The applicability of these structures is illustrated by using them to represent the data from experiments on the similarities among animal terms and on memory for sentences. An analysis based upon free trees is compared and contrasted with analyses using hierarchical clustering and multidimensional scaling.     

Aggression and power restoration: The effects of identifiability and timing on aggressive behavior

The study was designed to demonstrate that one function of aggression is the restoration of power. It was predicted that, after an individual had his power reduced, greater aggression would be emitted when the individual could be identified as the attacker by his victim than when he could not. It was felt that only when the aggressor was identifiable could he completely restore his power vis-à-vis the victim. A second aim of the study was to investigate the effects of timing of aggression on the intensity of aggression. It was predicted that in a learning situation, if aggression were utilized solely as a teaching device, greater aggression would be emitted by the “teacher” when the “learner” made mistakes early as opposed to late in the task. However, if the individual were motivated to restore his power by aggressing, greater aggression would occur when the mistakes were made late since having to wait should frustrate the teacher's desire to restore power through aggression. The design of the study was a 2 × 2 × 2 factorial in which subjects were either insulted or not, given the opportunity to aggress either anonymously or when clearly identified, and able to aggress either early or late in a learning task. The results supported the power-restoration hypothesis: Subjects who were insulted aggressed more when identifiable than when anonymous. Also, there was greater aggression in the early as opposed to late conditions under all circumstances except in the insultidentifiable condition.     

Perceptual similarity of mirror images in infancy

Perception of mirror images by three-to four-month infants was studied in five experiments using habituation paradigms. In the first experiment, babies discriminated right profiles of two different faces but not the left and right profile of the same face. In the second, babies discriminated a 45° oblique from a vertical line, but not the oblique from its mirror image. In the third, babies discriminated oblique lines that differed by 50° and were not mirror images. In the final experiments. 90° rotations of a ?-shape were discriminated but not 180° rotations that formed lateral or vertical mirror images. These results demonstrated that although babies were able to discriminate differences in orientation (even among obliques) they tended to view mirror images, especially lateral mirror images, as equivalent stimuli. We propose that the perceptual equivalence of mirror images reflects an adaptive mode of visual processing; mirror images in nature are almost always aspects of the same object, and they usually need not be discriminated. The relations of the perceptual similarity of mirror images to the ontogeny of the object concept and to the development of reading are discussed.     

Occupational level and Holland's theory for employed men and women

The main concern of this study was to investigate occupational level differences among men and women employed in Enterprising environments using the Vocational Preference Inventory (VPI) and the Self-Directed Search (SDS). The VPI and SDS were administered to 84 male and female workers at high (insurance managers) and low (route salespersons) occupational levels. All workers were employed in Enterprising environments. The findings showed that high occupational level workers tend to be more differentiated and more masculine than low occupational level workers. In addition, the results revealed that the employed men and women tend to respond differently to the VIP and the SDS. Finally, the evidence indicated that all of the occupational groups obtained mean scores on the Enterprising scale of the two inventories that were consistent with Holland's theoretical predictions.     

The effect of deprivation level during noncontingent pairings and instrumental learning on subsequent instrumental performance

In Experiment 1, rats received either response-noncontingent pairings of a tone stimulus with food or response-contingent instrumental training during which only responses in the presence of the tone were reinforced. During this training rats were maintained at either 70 or 90% of their growth-adjusted predeprivation body weights. In a subsequent test phase, one-half of the subjects in each training condition were tested under either 70 or 90% body weight. Subjects which had received response-contingent instrumental training under 70% body weight responded significantly faster to presentations of the tone than did 90% body weight-trained subjects, regardless of test deprivation condition. There was no effect of the deprivation level in effect during response-noncontingent pairings. In Experiment 2, rats received noncontingent tone-reward pairings or nonpairings under either 70 or 90% body weight. In a later test phase under 90% body weight, instrumental responding to the tone was significantly faster for subjects which had received the tone-reward pairings. Deprivation level during the pairings again produced no effect. These results support two conclusions. First, the expectancy learning process appears to be relatively independent of deprivation conditions in effect when such learning takes place; and secondly, deprivation conditions in effect during instrumental learning affect the strength of S-R associative bonds formed.     

Response uncertainty and imitation: The interactive effects of age and task options

It was reasoned that younger children would be more susceptible to situational uncertainty and thereby imitate more than older children or peers of the same age tested under more structured conditions. Children 6- through 8- and 12- through 14-years-old observed a model toss a bean bag at a target and were tested for target relevant and incidental imitation under conditions of two task options (high structure) or 10 task options (low structure). On both measures of imitation, preadolescents in the low structure condition imitated significantly more than adolescents. Preadolescents also imitated more incidental behavior in the low than in the high structure condition. Additionally, it was found that personality variables predicted imitative behavior of younger subjects in the low structure condition only.     

Confrontation naming impairment in dementia

In tone languages pitch variations (tones) serve to distinguish the lexical meanings of words. This study was conducted to examine the extent and nature of impairment in the perception of tones by aphasic patients who were monolingual speakers of Thai, a tone language which has five contrastive tones (mid, low, falling, high, rising). Six subjects participated in the study: two Broca aphasics, one transcortical motor aphasic, one conduction aphasic, one right brain-damaged nonaphasic, and one normal control. Three sets of stimuli (two real-speech, one synthetic-speech) were presented for identification, each set containing five Thai words minimally distinguished by tone. Results of the perception tests indicated that the performance of all four left brain-damaged aphasics differed significantly from that of the normal control, while the performance of the right brain-damaged nonaphasic did not. The normal performance of the right brain-damaged nonaphasic patient on this tone identification task suggests that deficits in the perception of tone exhibited by left brain-damaged patients can be attributed specifically to pathology in the language dominant hemisphere rather than to a general brain-damage effect. No difference in performance among the left brain-damaged patients could be attributed to a specific type of aphasic syndrome. The pattern of tonal confusions of the aphasics in comparison to that of normals suggests that their deficit is primarily quantitative rather than qualitative. Although two (mid, low) of the five tones accounted for a large percentage of the aphasics' errors, no uniform rank order of tones in terms of identifiability could be established across aphasic subjects, which suggests that their deficit is general to all five tones rather than selective to individual tones.