Varying response effort in the treatment of pica maintained by automatic reinforcement

Pica is a life-threatening behavior displayed by many individuals with developmental disabilities. In the current study, automatic reinforcement maintained the pica of 3 participants. Following functional analyses of pica, response-effort manipulations were conducted in which the effort to obtain pica or alternative items was varied systematically. Several general relations emerged as a result of the study. First, levels of pica were reduced relative to baseline when alternative items were available independent of the effort required to obtain alternative items or pica. Second, increasing the effort for alternative items resulted in increases in pica relative to when effort for alternative items was low. Third, increasing response effort for pica produced reductions in pica relative to baseline when alternative items were unavailable. Fourth, the highest levels of pica occurred when the effort to engage in pica was low or medium and no alternative items were available. These findings are discussed in terms of the relative effects of quality of reinforcement and response effort on behavior.     

Kainic acid lesions disrupt fear-mediated memory processing

Previous research has shown that hippocampal lesions impair the expression of fear conditioning. This fear conditioning deficit may be due to memory impairment or a reduction in fear in lesioned animals. To address these possibilities, the authors examined unconditioned and conditioned fear in male Sprague-Dawley rats that had received intracerebroventricular (ICV) infusions of kainic acid (KA) 30 days prior to testing. Animals that had received bilateral ICV infusions of KA (1.0 microl of 0.8 mg/ml solution per side) exhibited cell loss that was primarily confined to the CA3 region of the dorsal hippocampus. Kainic acid lesions impaired contextual and cued fear conditioning but did not affect unconditioned fear in a light:dark test of anxiety. Moreover, animals with KA lesions did not habituate to the light:dark apparatus when tested over a 3-day period. These data suggest that decreases in fear conditioning produced by hippocampal lesions reflect a memory deficit and not a lack of fear.     

The origins of symbolic racism

The theory of symbolic racism places its origins in a blend of anti-Black affect and conservative values, particularly individualism. We clarify that hypothesis, test it directly, and report several findings consistent with it. Study 1 shows that racial prejudice and general political conservatism fall into 2 separate factors, with symbolic racism loading about equally on both. Study 2 found that the anti-Black affect and individualism significantly explain symbolic racism. The best-fitting model both fuses those 2 elements into a single construct (Black individualism) and includes them separately. The effects of Black individualism on racial policy preferences are mostly mediated by symbolic racism. Study 3 shows that Black individualism is distinctively racial, with effects distinctly different from either an analogous gender individualism or race-neutral individualism.     

The effects of noncontingent access to food on the rate of object mouthing across three settings

Object mouthing is associated with several potential deleterious side effects. In the current investigation, we modified the use of noncontingent access to competing items (food) and evaluated the effects of the treatment on object mouthing across three settings. Results demonstrated reductions in mouthing associated with the modified treatment.     

Conceptions of conflict in psychoanalytic theory and practice

There are many different views of conflict in contemporary psychoanalysis, each with its own technical implications. After reviewing the psychoanalytic origins of the concept of conflict, the author discusses the diverse positions of four North American conflict theorists, each of whom offers a different view of the location of conflict both in the mind of the patient and in the material of the clinical hour. The role of conflict in the work of several relational psychoanalysts is then examined. A tentative approach toward integration is proposed.     

Sex-Related HIV/AIDS Prevention Among African American College Students: Issues for Preventive Counseling

This study examined condom use during oral and anal sex among 1,593 African American male and female college undergraduates. Findings suggest a high level of concordance between men and women on several measures. However, female participants were more likely to use condoms during oral and anal sex than were male participants.     

Relation of Family Problems to Patterns of Delinquent Involvement Among Urban Youth

The relation of patterns of family problems and patterns of delinquent behavior over time was evaluated among a sample of inner-city minority adolescent males. Empirically derived groups were identified and included: nonoffenders, chronic minor offenders, escalators, and serious chronic offenders. Patterns of family problems were also identified and differentially related to delinquency groups. Members of the group involved in serious chronic offending were more likely to have families characterized by multiple problems including disruption, conflict, and lack of parental involvement, sometimes so extreme as to meet the legal requirement of neglect. They were also more likely to have families characterized by deviant behavior and attitudes. The finding of specific relations between types of family problems and patterns of delinquent behavior has important implications for intervention and prevention. Rather than assuming a general relation between family functioning and delinquent involvement, specific aspects of family functioning may need to be targeted to affect different patterns of delinquent involvement.