Explanation: Pragmatics and asymmetry

This paper derives from an NEH Summer Seminar for College Teachers on scientific explanation directed by Paul Humphreys at the University of Virginia in the summer of 1991. I am indebted to Professor Humphreys for his comments on many drafts. A previous version was presented at the Pacific Division Meetings of the APA in March 1992. For encouragement regarding, comments on, and criticisms of prior versions, I'd also like to thank Eric Barnes, Carol Cleland, Gary Ebbs, Geoffrey Gorham, Geoffrey Hellman, Elizabeth Lloyd, Larry Shapiro, Alison Simmons, and David Stump. Special thanks to Bas van Fraassen for correspondence on these issues, and to Philip Kitcher for encouragement. I am responsible for all remaining errors.     

Religious Conversion and Personality Change

The question of whether religious conversion causes changes in someone's personality is examined in light of two bodies of literature—the research on personality change and the research on conversion. When the theory and research on personality change is applied to the question of whether conversion causes such change, the answer depends on what level of personality is of concern. Research on the relation between religious conversion and a variety of behavioral, attitudinal, emotional, and lifestyle variables is consistent with this conclusion. Although conversion seems to have minimal effect on elemental functions such as the Big Five traits or temperaments, it can result in profound, life transforming changes in mid-level functions such as goals, feelings, attitudes, and behaviors, and in the more self-defining personality functions such as identity and life meaning. This seems to be so whether the process of conversion is sudden or gradual, active or passive, and to a traditional Western or Eastern religion or to a new religious movement. However, most of the research is retrospective and cross-sectional, and no systematic program of research has ever been sustained. Suggestions for the form of future research are made, and a model for integrating the many factors that must be taken into account and for guiding future research is sketched.     

Tactile discrimination of competing sounds

Discriminably different sounds, concurrently presented from the left and right of the medial plane, were reduced in angular separation until subjects could no longer detect which sound was “left” and which was “right.” The procedure was repeated with hearing masked and judgments made on the basis of the tactile signals at two fingertip vibrators that received their inputs from two miniature microphones bilaterally located on the subject’s head. Auditory and tactile performance were compared under active (head movements permitted) and passive (head held still) conditions. Active and passive performance were not significantly different. Auditory and tactile performance became no better than chance at angular separations of 2.7° and 4.4°, respectively. Touch compared sufficiently well with audition to support arguments for the inclusion of sound localization information in devices which use the skin as a substitute for the ear. nt]mis|This research was conducted at the Smith-Kettlewell Institute of Visual Sciences, San Francisco, California. This institute provided the apparatus for the experiment. B. L. Richardson was on Staff Development Leave from the Applied Psychology Department of the Caulfield Institute of Technology, Melbourne, Australia.     

Dr. Richardson

Pastoral Psychology -     

Psychological well‐being and day‐to‐day social interaction among older adults

A sample of 113 healthy older adults used a variant of the Rochester Interaction Record to describe the social interactions they had each day for two weeks. They also completed various measures of psychological well‐being including life satisfaction and loneliness. A series of multilevel random coefficient analyses found that life satisfaction scores were positively related to how enjoyable interactions were, how self‐assured people felt when interacting, how much control they felt they had over interactions, how responsive others were to their needs, and how socially active they were. Analyses that took participants’ marital status into account suggested, however, that interaction outcomes and life satisfaction were related only for married participants, and that these relationships were primarily due to interaction outcomes with spouses.     

GABA(A) receptors determine the temporal dynamics of memory retention

Four experiments studied the role of GABA(A) receptors in the temporal dynamics of memory retention. Memory for an active avoidance response was a nonmonotonic function of the retention interval. When rats were tested shortly (2 min) or some time (24 h) after training, retention was excellent, but when they were tested at intermediate intervals (1-4 h), retention was poor. Activity at GABA(A) receptors was critical for impairing memory retention at the intermediate intervals because injection of the GABA(A) receptor partial inverse agonist FG7142 prior to test significantly improved performance. These retention enhancing effects of FG7142 were dose-dependent and not due to any nonspecific effects of FG7142 on activity. Our results suggest that the temporal dynamics of memory retention may be caused by variations in neurotransmission through the GABA(A) receptor in the post-training period.     

Visual tracking and entrainment to an environmental rhythm

This study investigated the role that visual tracking plays in coupling rhythmic limb movements to an environmental rhythm. Two experiments were conducted in which participants swung a hand-held pendulum while tracking an oscillating stimulus or while keeping their eyes fixed on a stationary location directly above an oscillating stimulus. It was expected that the participants' rhythmic movements would become entrained to the oscillating stimulus in both conditions but that visual tracking would strengthen this entrainment. Experiment 1 investigated the role of visual tracking in establishing unintentional entrainment. Experiment 2 investigated the role of visual tracking in intentional entrainment. As predicted, participants exhibited greater unintentional coordination and more stable intentional coordination when they tracked the stimulus. These findings highlight the importance of understanding the role of eye movements in environmental coordination.     

Articulatory constraints on interpersonal postural coordination

Cooperative conversation has been shown to foster interpersonal postural coordination. The authors investigated whether such coordination is mediated by the influence of articulation on postural sway. In Experiment 1, talkers produced words in synchrony or in alternation, as the authors varied speaking rate and word similarity. Greater shared postural activity was found for the faster speaking rate. In Experiment 2, the authors demonstrated that shared postural activity also increases when individuals speak the same words or speak words that have similar stress patterns. However, this increase in shared postural activity is present only when participants' data are compared with those of their partner, who was present during the task, but not when compared with the data of a member of a different pair speaking the same word sequences as those of the original partner. The authors' findings suggest that interpersonal postural coordination observed during conversation is mediated by convergent speaking patterns.