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).     

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.     

Aversive and compensatory classical conditioning with diazepam as conditional stimulus

The purpose of the first experiment was to investigate whether diazepam could acquire anxiogenic properties by signalling an aversive event. Rats were trained in an operant chamber in the pentylenetetrazol (PTZ) model of anxiety. Thereafter the animals were divided into groups that received classical diazepam conditioning (Group 1), and conditioning of diazepam + tone (Group 2). In the test phase diazepam was injected prior to placement in the operant chamber. Group 2 selected the PTZ-appropriate lever more often than the other groups, indicating that the tone induced anxiety, and diazepam did not. Tones and shock may therefore be more easily associated than diazepam and shock. The second experiment investigated this. Rats were trained the same way as in the first experiment. Thereafter the experimental group received injections of a small dose of diazepam prior to a second injection of a large dose of diazepam. The hypothesis was that a compensatory anxiogenic conditional response to diazepam's anxiolytic effect should be elicited by the small dose. There were no differences between the groups in lever selection, indicating that a compensatory anxiogenic response was not elicited.     

Family Therapy in India: A New Profession in an Ancient Land?

This paper examines the need for family therapy in India and its evolution as an integrated academic discipline and widespread form of clinical practice. Included is a discussion of the numerous factors placing Indian families at risk today, both common and more serious child, marital, and family difficulties, the current status of mental health services and minimal emphasis on family-based treatment, and the potential benefits of family therapy to such a radically diverse and rapidly changing society. Targets of and settings for family therapy training are highlighted, and a brief outline of a training-the-trainer approach is provided.