Learning to control brain activity: a review of the production and control of EEG components for driving brain-computer interface (BCI) systems

Brain-computer interface (BCI) technology relies on the ability of individuals to voluntarily and reliably produce changes in their electroencephalographic (EEG) activity. The present paper reviews research on cognitive tasks and other methods of generating and controlling specific changes in EEG activity that can be used to drive BCI systems. To date, motor imagery has been the most commonly used task. This paper explores the possibility that other cognitive tasks, including those used in imaging studies, may prove to be more effective. Other factors which influence performance are also considered in relation to selection of tasks, as well as training of subjects.     

Managing group process in nonprocess groups: Working with the theme-centered psychoeducational group

While there has been a recent proliferation of groups for consultative and psychoeducational purposes, little has been written about using the group process in these nonprocess groups. This paper investigates the management of various group processes in a group whose contracted focus is teaching stress management skills. Distinctions are made between psychotherapeutic and theme-centered psychoeducational process management. Many group processes can be predicted given the group's normal developmental stages, while other ongoing group processes arise spontaneously. A working dialogue between the presented content and the emerging process is necessary in order for psychoeducation to be personalized and most fully assimilated. A clinical vignette follows the evolution of a stress management group conducted for high-level executives who have been identified as manifesting Type-A behaviors. For each session, the format and material content are briefly outlined, the emerging group process is described, and the clinical interventions involved in the process management are discussed.     

Resource utilization in mixed-sex dyads: The influence of adult presence and task type

This study explores the effects of context on cross-sex dominance. An emerging finding in the sex differences literature is that boys are often more successful than girls at influencing members of the other gender. As a result, boys tend to get more than their share of a scarce resource in mixed-sex situations. Because the presence of adults inhibits just those strategies that boys use successfully when dominating girls, we hypothesize that the presence of an adult will reduce or eliminate the sex difference in access to a scarce resource. This should be particularly true for tasks in which boys' strategies are most likely to be effective. To test this hypothesis, dominance (as evidenced by asymmetry in gaining access to a scarce resource) was measured while 48 boy-girl pairs, ranging in age from 42 to 60 months, negotiated turn taking at a movie viewer in either the presence or absence of an adult (adult location factor) in a situation that either did or did not require the cooperation of the second child in order to see cartoons (task type factor). For the cooperative task, neither sex significantly dominated the other in either the presence or absence of the adult. In contrast, for the competitive task, boys dominated in the absence of the adult. When the adult was present, however, boys and girls shared more equally. An examination of the strategies children used in the competitive task indicated that boys were inhibited in the adult's presence, dropping their rate of demands and giving girls longer turns. Implications for gender segregation and for sex differences in seeking proximity to adults are discussed.Portions of this paper were presented at the biennial meeting of the Society for Research in Child Development in Baltimore, Maryland, April 1987. This research was supported, in part, by a National Science Foundation Graduate Fellowship. The authors are grateful for the cooperation of the directors, staffs, parents, and children of the preschools that participated in the study; Bing School, Convenant Presbyterian Preschool, Menlo Park Presbyterian Nursery School, Buttons 'N Bows Preschool, Community Preschool, and Foothill College Child Care Center. We are also inebted to Carolyn Johnson, Robert McClure, Ennis Blount, Paul Endo, and Lara Helms for serving as experimenters, and to Colleen Kerrigan, Kathryn Shade, Diane Walters, Deborah Haley, Ira Lit, and Caroline Collins for their work in coding the data. Finally, we would like to thank Ellen Markman for reading and commenting on an earlier draft of the paper, and Mary Parpal, whose helpful comments and other contributions are greatly appreciated.     

An evaluation of a person-centred gestalt group using the semantic differential

This study assessed the types of attitude changes that occurred among counselling students of a US university who were involved in a person-centred gestalt training group. A semantic differential was used to evaluate the effects of the group. The results showed that the members rated the potency scales of the semantic differential concepts, gestalt therapy, love and future, higher because they participated in the group.     

Abstraction and its Limits: Finding Space For Novel Explanation

Several modern accounts of explanation acknowledge the importance of abstraction and idealization for our explanatory practice. However, once we allow a role for abstraction, questions remain. I ask whether the relation between explanations at different theoretical levels should be thought of wholly in terms of abstraction, and argue that changes of the quantities in terms of which we describe a system can lead to novel explanations that are not merely abstractions of some more detailed picture. I use the example of phase transitions as described by statistical mechanics and thermodynamics to illustrate this, and to demonstrate some details of the relationship between abstraction, idealization, and novel explanation.     

The influence of brief episodes of aerobic exercise activity,soothing music-nature scenes condition,and suggestion on coping with test-taking anxiety

This study examines the influence of aerobic exercise activity, soothing musicnature scenes condition, and suggestion on coping with test-taking anxiety. Sixty test anxious subjects were randomly assigned to four treatment groups consisting of 15-min episodes of exercise or soothing music-nature scenes condition with or without verbal suggestion that the treatment task in which they were engaged would be helpful to them. A videotaped intelligence test used to stimulate test-taking anxiety was given to the subjects after the soothing music-nature scenes condition or exercise tasks. The Multiple Affect Adjective Checklist (MAACL) was used to appraise anxiety during the laboratory procedures. Results indicate that exercise, soothing music-nature scenes condition, and suggestion play a role in reducing anxiety. While relaxation activity proved to be superior to exercise in reducing anxiety immediately following the treatment episode, these differences disappear following exposure to a stressful IQ test and exercise (as well as suggestion) had a better stress inoculation effect than soothing music-nature scenes condition or no suggestion.     

The psychiatric nurse as group psychotherapist

An overview of current dimensions of group psychotherapy practice by psychiatric-mental health nurses is presented. The relationship between graduate education and the characteristics of the nurses' current practice is demonstrated. The psychiatric-mental health nurse's involvement in the general health care arena with nonpsychiatric populations is highlighted. Future trends for the practice of group by nurses is explicated and projected. In addition, implications for the education and practice of other group practitioners is drawn.Marianne DiMinno, R.N., M.S.N., assisted in the development of the survey questionnaire.     

Activation of bipolar prototypes in attribute inferences

The present study examined how prototypes, as organizational principles of knowledge about persons, affect attribute inference judgments. A distinction is drawn between bipolar and unipolar categories. Two questions are addressed: First, whether only one or both prototypes of bipolar categories like extraversion-introversion are activated in making inference judgments, and second, whether information about the applicability of a stimulus item to a target is processed differently than information about the inapplicability of the stimulus item. The results support the hypothesis that only one prototype is activated and that this is the affirmative one, irrespective of whether the stimulus information is applicable or inapplicable to the target person. The implications of these findings are discussed.     

Natural categories

The hypothesis of the study was that the domains of color and form are structured into nonarbitrary, semantic categories which develop around perceptually salient “natural prototypes.” Categories which reflected such an organization (where the presumed natural prototypes were central tendencies of the categories) and categories which violated the organization (natural prototypes peripheral) were taught to a total of 162 members of a Stone Age culture which did not initially have hue or geometric-form concepts. In both domains, the presumed “natural” categories were consistently easier to learn than the “distorted” categories. Even when not central, natural prototype stimuli tended to be more rapidly learned and more often chosen as the most typical example of the category than were other stimuli. Implications for general differences between natural categories and the artificial categories of concept formation research were discussed.