Effects of reinforcement schedule on facilitation of operant extinction by chlordiazepoxide

Learning and memory are central topics in behavioral neuroscience, and inbred mice strains are widely investigated. However, operant conditioning techniques are not as extensively used in this field as they should be, given the effectiveness of the methodology of the experimental analysis of behavior. In the present study, male C57B1/6 mice, widely used as background for transgenic studies, were trained to lever press on discrete-trial fixed-ratio 5 or fixed-interval (11 s or 31 s) schedules of food reinforcement and then exposed to 15 extinction sessions following vehicle or chlordiazepoxide injections (15 mg/kg i.p., administered either prior to all extinction sessions, or prior to the final 10 extinction sessions). Extinction of operant behavior was facilitated by drug administration following training on either schedule, but this facilitation only occurred once a number of extinction sessions had taken place. The extinction process proceeded more rapidly following fixed-interval training. Resistance to extinction was equally high following training with either schedule type, and was reduced by drug administration in both cases. These phenomena were evident in individual cumulative records and in analyses of group data. Results are interpreted in terms of phenomena of operant extinction identified in Skinner's (1938) Behavior of Organisms, and by behavioral momentum theory. These procedures could be used to extend the contribution of operant conditioning to contemporary behavioral neuroscience.     

Human reproduction: dominion and limits.

The general struggle throughout Christian history has been to seek the proper balance between dominion and limits, intervention and nonintervention, givenness, and creativity. This struggle has worked itself out in six areas that touch human life. In this essay, I will revisit the Catholic tradition's treatment of these in terms of dominion and limits to see whether we can discern developmental patterns that might suggest an approach to issues pertaining to the sources of life (reproductive ethics) as we move into the next century.     

Preferential selection and stereotypes: Effects on evaluation of female leader performance,subordinate goal commitment,and task performance

In a laboratory setting, 135 undergraduate students (69 male, 66 female; approximately 98% white) completed a mock class scheduling task led by a female confederate who was chosen either preferentially or by merit. Results indicated that (1) subordinate evaluations of female leader performance were not affected by preferential selection, but were significantly related to degree of non-traditional views held toward female managers; (2) commitment to the goal assigned by the female leader was not lessened by preferential selection, but also was significantly related to degree of non-traditional views toward female managers; and (3) subordinate performance on the scheduling task was significantly related to commitment to the leader-assigned goal.     

Objective Evaluation of the Process and Effects of Analytic Group Psychotherapy with Adolescent Girls

This article, written from a relational perspective, describes a shift that is taking place in the thinking of many psychodynamically oriented psychotherapists regarding the practice of therapy and the implications it has for group therapists. The shift, from one-person to two-person and multiperson theory, has particular importance for group leaders since it recommends making the subjective involvement of the therapist in the interactional field of the group much more a part of the treatment process. Theory and research on the use of countertransference, noninterpretive interventions, humor, and spontaneity by the leader are reviewed and vignettes are presented to illustrate the application of these ideas. Guidelines regarding the application of such ideas in group therapy are also discussed.     

Action Observation and Imagery Training Improve the Ease With Which Athletes Can Generate Imagery

Imagery can improve sport performance, although its efficacy is mediated by the ease with which athletes can generate images. Establishing techniques that improve this imagery ability factor is desirable to enhance the effectiveness of imagery interventions. Twenty-seven club-level female golfers were assigned to imagery, action observation, or physical practice training groups (n = 9). Changes in image generation ease were assessed using the Revised Movement Imagery Questionnaire over an 8-week period. Imagery and action observation training were both effective in improving aspects of imagery ability. Action observation can provide sport psychologists with an effective tool for improving visual imagery ability in athletes.     

Come-ons and Put-offs: Unmarried Students' Strategies for Having and Avoiding Sexual Intercourse

One-hundred and twenty male and 109 female unmarried college students participated in a questionnaire study of actual and expected male-female differences in the use of 10 strategies for having and avoiding sexual intercourse. As predicted, both men and women viewed strategies for having sex as used predominantly by males and strategies for avoiding sex as used predominantly by females. However, sex-role attitudes were unrelated to students' expectations of sexual encounters. Both traditional and profeminist students expected that strategies for having sex would be used predominantly by males and strategies for avoiding sex would be used predominantly by females. It appeared that students still stereotyped having sex as a male goal and avoiding sex as a female goal. Men and women were unexpectedly similar in their personal strategies for influencing a sexual encounter. Both men and women reported using more indirect strategies to have sex and more direct strategies to avoid having sex. These findings suggest that when men and women share the same goals (such as having or avoiding sex), expected differences between male and female influencing agents disappear     

Strangers at the benchside: research ethics consultation

Institutional ethics consultation services for biomedical scientists have begun to proliferate, especially for clinical researchers. We discuss several models of ethics consultation and describe a team-based approach used at Stanford University in the context of these models. As research ethics consultation services expand, there are many unresolved questions that need to be addressed, including what the scope, composition, and purpose of such services should be, whether core competencies for consultants can and should be defined, and how conflicts of interest should be mitigated. We make preliminary recommendations for the structure and process of research ethics consultation, based on our initial experiences in a pilot program.     

Counseling Clients Who Self‐Injure: Ethical Considerations

This article provides an overview of ethical considerations related to counseling clients who engage in self‐injurious behaviors. Ethical issues concerning client welfare, counselor competence, countertransference, referral and consultation, informed consent, and duty to protect are discussed in relation to the American Counseling Association's (1995) Code of Ethics and Standards of Practice. Implications and recommendations for counselors who work with clients who self‐injure are provided.     

Neural correlates of facial emotion processing in infancy

In the present study we examined the neural correlates of facial emotion processing in the first year of life using ERP measures and cortical source analysis. EEG data were collected cross‐sectionally from 5‐ (N = 49), 7‐ (N = 50), and 12‐month‐old (N = 51) infants while they were viewing images of angry, fearful, and happy faces. The N290 component was found to be larger in amplitude in response to fearful and happy than angry faces in all posterior clusters and showed largest response to fear than the other two emotions only over the right occipital area. The P400 and Nc components were found to be larger in amplitude in response to angry than happy and fearful faces over central and frontal scalp. Cortical source analysis of the N290 component revealed greater cortical activation in the right fusiform face area in response to fearful faces. This effect started to emerge at 5 months and became well established at 7 months, but it disappeared at 12 months. The P400 and Nc components were primarily localized to the PCC/Precuneus where heightened responses to angry faces were observed. The current results suggest the detection of a fearful face in infants’ brain can happen shortly (~200–290 ms) after the stimulus onset, and this process may rely on the face network and develop substantially between 5 to 7 months of age. The current findings also suggest the differential processing of angry faces occurred later in the P400/Nc time window, which recruits the PCC/Precuneus and is associated with the allocation of infants’ attention.