Effects of contingency violations on the extinction of a conditioned fear inhibitor and a conditioned fear excitor

Rats were used in a conditioned-suppression paradigm to assess the effects of contingency variations on responding to a conditioned inhibitor (CS-) and a conditioned excitor (CS+). In Experiment 1, various unconditioned stimulus (US) frequencies were equated across the presence and absence of a CS- in the context of either background cues (continuous-trial procedure) or an explicit neutral event (discrete-trial procedure). With both procedures, a CS-alone treatment enhanced inhibition, whereas treatments involving 50% or 100% reinforcement for the CS- eliminated inhibition without conditioning excitation to that CS. The latter outcome also occurred in Experiment 2, with discrete-trial training equating considerably reduced US frequencies for the presence and absence of the CS-. In further evidence that inhibition was eliminated without conditioning excitation to the CS-, Experiment 3 showed that a novel CS did not acquire excitation when 25%, 50%, or 100% reinforcement was equated across the presence and absence of that CS in the context of a discrete-trial event. Using the procedures of Experiment 1, Experiment 4 showed that a CS+ was extinguished by a CS-alone treatment but was substantially maintained by treatments involving 50% or 100% uncorrelated reinforcement. These effects for a CS+ and a CS- implicate CS-US contiguity, rather than contingency, as the factor determining the extinction of a CS.     

Germ-line gene therapy and the clinical ethos of medical genetics

Although the ability to perform gene therapy in human germ-line cells is still hypothetical, the rate of progress in molecular and cell biology suggests that it will only be a matter of time before reliable clinical techniques will be within reach. Three sets of arguments are commonly advanced against developing those techniques, respectively pointing to the clinical risks, social dangers and better alternatives. In this paper we analyze those arguments from the perspective of the client-centered ethos that traditionally governs practice in medical genetics. This perspective clarifies the merits of these arguments for geneticists, and suggests useful new directions for the professional discussion of germ-line gene therapy. It suggests, for example, that the much discussed prospect of germ-line therapy in human pre-embryos may always be more problematic for medical genetics than adult germ-line interventions, even though the latter faces greater technical difficulties.     

The Perception of Teasing Scale (POTS): a revision and extension of the Physical Appearance Related Teasing Scale (PARTS)

This article describes the development and validation of a revised measure for the assessment of history of being teased about physical appearance. Study 1 involved the preliminary psychometric evaluation of the questionnaire on a sample of 227 college women, Two factors emerged: Weight-Related Teasing (WT) and Teasing About Abilities/Competencies (Competency Teasing; CT). The integrity of the factor structure of these two scales was established in Study 2 with a sample of 87 college women. Internal consistency ratios in this sample were also found to be acceptable. In Study 3, 92 college women were administered measures of body image, eating disturbance, and self-esteem to test for convergence with the Perception of Teasing Scale. Subjects also rated teasing items for frequency and effect (e.g., how upset they were by the teasing). Two-week test-retest reliabilities for these measures were acceptable. Weight-Related Teasing correlated to a greater degree with other measures than Competency Teasing. Regression analyses revealed the importance of a frequency versus effect dimension. Findings are discussed in light of recent research on developmental factors in body image and eating disturbance.     

Encouraging College Males to Perform Testicular Self-Examination: Evaluation of a Persuasive Message Based on the Revised Theory of Reasoned Action1

This study evaluated the effect of a persuasive message derived from a revised version of the theory of reasoned action on the performance of testicular self-examination (TSE). Subjects (114 male college students) were randomly assigned to listen to a taped persuasive message challenging unfavorable outcome beliefs (as suggested by the theory of reasoned action), a message on testicular cancer information, or no message. All subjects then completed a questionnaire operationalizing the components of the theory of reasoned action (revised to incorporate self-efficacy). As predicted, there was a significant relationship between exposure to the persuasive message and self-reported TSE performance (χ²(2) = 15.66, p < .0001). Sixty-three (71.23%) of the subjects contacted at a 4-week follow-up reported performing the exam. Of those, 44.23% had heard the theory-based message, 36.54% had heard the informational message, and 19.23% had not been exposed to a message. A path analysis of the relationships among components of the theoretical model provided partial support for the hypothesized causal pathways between message exposure and TSE intention and behavior.     

Counseling the incest offender

The Center Against Sexual Assault in Phoenix, Arizona is currently treating 50 incest offenders in its Offender Group treatment program. The average age range is 31–45 years old, and 80 percent were sexually or physically abused as children. These men have been found to be extremely self-centered, exhibit poor impulse control, and possess a strong denial of reality. The treatment program includes several intake sessions to ascertain suitability of the offender to this type of therapeutic approach and a stated self-admission of at least the possibility of incestuous involvement. The offenders work in groups, as well as individual sessions.     

The role of group therapy in incest counseling

The use of group therapy is an essential component in the treatment program for victims of incest, their families, and offenders at the Center Against Sexual Assault in Phoenix, Arizona. Four types of groups are conducted on a continuous basis: (a) adults who were victims as children, (b) families of victims, (c) offenders, and (d) child victims. Group therapy is the predominant treatment modality for the 400 incestuous families seen at CASA. Details of each of the four groups are given in this article.     

A COMPARISON OF TWO INTERVENTION ROLES: PEER MONITOR AND POINT EARNER

Two fifth-grade students' high levels of off-task and disruptive behavior decreased rapidly during an intervention in which they were appointed peer monitors or point earners. The children worked in dyads in which one child served as a peer monitor and the other child earned points from his or her monitor for good behavior. Points were accumulated as part of a group contingency. We introduced the two appointments in an independent math period and alternated the appointments across days. The peer monitor and point earner roles, when alternated on an every-other-day basis, were equally effective in reducing the students' inappropriate behavior. Furthermore, their behavior during intervention fell well within the range of inappropriate behavior levels exhibited by classmates. The speed with which both students completed their math problems increased during both appointments. The accuracy of their academic work, however, varied; one student improved slightly and the other student decreased slightly in accuracy.     

Formal relationships among words and the organization of the mental lexicon

A series of experiments investigated the role of orthography in the organization of the mental lexicon. A pilot experiment had found no effect of formal overlap between words on a repetition priming task at a lag of 56 intervening items. The first two experiments reported here used a lag of zero and varied SOA. Formal priming was found at SOAs of 1,650 milliseconds and less. However, reducing the proportion of related primes and targets in the experiment reduced formal priming. Moreover, it did so not by affecting response times to formally related primes and targets but by reducing response times to comparison trials in which primes and targets were unrelated. This led to a hypothesis that the formal priming we had observed was only apparent and due to strategic inhibition of responses to unrelated prime-target pairs. The final experiment reduced the proportion of responses to related targets further and examined formal priming at lags of 0, 1, 3, and 10. No formal priming was found under these conditions. Across all experiments, where formal priming occurred, it was due to changes in levels of inhibitory priming in comparison conditions. The conclusion is drawn that convincing evidence for an orthographic or phonological organization of the lexicon is not obtainable using priming procedures.This research was supported by NIH Grant HD 01994 to Haskins Laboratories