Developmental changes in the response to obstacles during prehension

Adults are proficient at reaching to grasp objects of interest in a cluttered workspace. The issue of concern, obstacle avoidance, was studied in 3 groups of young children aged 11-12, 9-10, and 7-8 years (n=6 in each) and in 6 adults aged 18-24 years. Adults slowed their movements and decreased their maximum grip aperture when an obstacle was positioned close to a target object (the effect declined as the distance between target and obstacle increased). The children showed the same pattern, but the magnitude of the effect was quite different. In contrast to the adults, the obstacle continued to have a large effect when it was some distance from the target (and provided no physical obstruction to movement).     

Depression proneness in treatment-seeking smokers: a taxometric analysis

Using taxometric procedures, we examined latent distribution of depression proneness and the construct validity of the Depression Proneness Inventory (DPI) within a group of 439 non-depressed smokers participating in a smoking cessation trial. Three taxometric procedures MAMBAC, MAXEIG, and L-MODE, supported the presence of a distinct subgroup of depression prone smokers. A set of indicators including cognitive vulnerabilities, self-reported tendencies to feel inadequate and experience depressive symptoms, as well as recent experiences of depressive symptoms prior to anticipated cessation treatment behaved taxonically suggesting a shared relationship with an underlying taxonic causal factor. The DPI was found to be an efficient index of taxon membership and a strong predictor of depression history. The DPI identifies a subgroup of smokers seeking cessation treatment that carry affective risk factors known to impede successful smoking cessation and might benefit from interventions targeting depression and negative mood.     

The effect of volition on the stability of bimanual coordination

The authors investigated how the intention to passively perform a behavior and the intention to persist with a behavior impact upon the spatial and temporal properties of bimanual coordination. Participants (N = 30) were asked to perform a bimanual coordination task that demanded the continuous rhythmic extension-flexion of the wrists. The frequency of movement was scaled by an auditory metronome beat from 1.5 Hz, increasing to 3.25 Hz in.25-Hz increments. The task was further defined by the requirement that the movements be performed initially in a prescribed pattern of coordination (in-phase or antiphase) while the participants assumed one of two different intentional states: stay with the prescribed pattern should it become unstable or do not intervene should the pattern begin to change. Transitions away from the initially prescribed pattern were observed only in trials conducted in the antiphase mode of coordination. The time at which the antiphase pattern of coordination became unstable was not found to be influenced by the intentional state. In addition, the do-not-intervene set led to a switch to an in-phase pattern of coordination whereas the stay set led to phase wandering. Those findings are discussed within the framework of a dynamic account of bimanual coordination.     

Introduction to international perspectives on therapeutic jurisprudence

Therapeutic Jurisprudence (TJ), a concept first conceived by law professors David Wexler (University of Puerto Rico and University of Arizona) and Bruce Winick (University of Miami) only a little more than a decade ago, has emerged as the leading conceptual perspective in the mental health law field. Indeed, a LEXIS search reveals well over 150 articles on, or citing to, therapeutic jurisprudence in American law review publications in the past decade (terms used were "therapeutic w/5 jurisprudence w/25 Wexler or Winick"). Copyright 1999 John Wiley & Sons, Ltd.     

The Relation of Self-Reported Abilities to Aptitude Test Scores: A Replication and Extension

Scales from the Self-Directed Search (SDS) were correlated with those of the Ball Aptitude Battery (BAB) for a sample of 198 high school students. The present study found larger canonical correlations between the SDS and aptitude measures than those reported by Kelso, Holland, and Gottfredson (1977). However, the variance across the data sets associated with these canonical correlations was minimal, and much of the shared variance associated with the BAB canonical variates was due tog, with specific abilities contributing only minor portions of the observed shared variance.     

Processing empty categories: A parallel approach

In many current theories of human sentence processing, the mechanisms and principles proposed to account for data related to processing (1) long-distance dependencies and (2) structural ambiguities, such as garden-path sentences, are independent, despite the fact that deciding whether or not to posit a gap is just a special case of ambiguity resolution. In this paper we demonstrate how the parallel parsing theory proposed by Gibson (1991, in press)—which was developed to account for nongap ambiguity resolution data—also explains a number of gap-positing facts, without additional strategies. In particular, we show how this theory correctly explains filled-object-gap effects and the lack of filled-subject-gap effects in English, as well as certain gap-processing effects in Dutch.     

Stimulus control in a simple instrumental task: The role of internal and external stimuli

Two experiments using rats in a straight alley runway task tested the hypothesis that standard stimuli such as tones and lights (“external” stimuli) and schedule-generated aftereffect stimuli (“internal” stimuli) operate similarly and are similarly subject to the compounding rules specified by R. A. Rescorla and A. R. Wagner (In A. Black & W. Prokasy (Eds.), Classical conditioning II: Current theory and research. New York: Appleton-Century-Crofts, 1972). The experimental task was an instrumental analog of the classic blocking experiment (L. J. Kamin, In M. R. Jones (Ed.). In Experiment 1, blocking of an external discriminative stimulus by a different asymptotic discrimination was accomplished. In Experiment 2, blocking of an internal stimulus discrimination by an asymptotic external stimulus discrimination was obtained. The present results support the view that internal and external stimuli are indeed similar and function in the same manner with regard to blocking of stimulus control.     

Counselling implications of anxiety and depression in AIDS and HIV infection: A pilot study

Anxiety and depression are two major psychological reactions to HIV infection. The recognition and treatment of these are of fundamental importance as they may alleviate the suffering for those with a potentially terminal illness, may increase coping and may improve the quality of their life. Furthermore, many of the physical symptoms associated with anxiety mirror AIDS symptoms. For prompt care it is important that those with HIV/AIDS, and those caring for them, recognize the role of anxiety to minimize unnecessary symptoms and recognize those which could respond to medical intervention. In this study a group of front line AIDS/HIV workers were given an in-depth training course on anxiety and depression. Evaluation of the course revealed a high number of patients suffering from anxiety (80.1%) and depression (31%). The evaluation revealed gains in counselling proficiency, knowledge and symptom recognition. Some of the entrenched myths, particularly surrounding suicide, were not resolved. These findings are discussed in the light of the difficulties of training non-mental health workers in the use of counselling skills.