Sensorimotor prediction and memory in object manipulation.

When people lift objects of different size but equal weight, they initially employ too much force for the large object and too little force for the small object. However, over repeated lifts of the two objects, they learn to suppress the size-weight association used to estimate force requirements and appropriately scale their lifting forces to the true and equal weights of the objects. Thus, sensorimotor memory from previous lifts comes to dominate visual size information in terms of force prediction. Here we ask whether this sensorimotor memory is transient, preserved only long enough to perform the task, or more stable. After completing an initial lift series in which they lifted equally weighted large and small objects in alternation, participants then repeated the lift series after delays of 15 minutes or 24 hours. In both cases, participants retained information about the weights of the objects and used this information to predict the appropriate fingertip forces. This preserved sensorimotor memory suggests that participants acquired internal models of the size-weight stimuli that could be used for later prediction.     

Validity of the sex-role egalitarianism scale: Discriminating egalitarianism from feminism

To explore and to clarify the discriminant validity of the sex role egalitarianism construct, the Sex-Role Egalitarianism Scale (SRES) was administered in conjunction with the Attitudes Toward Women Scale (AWS) and eight personality trait measures to 108 individuals. Results indicated a hypothesized curvilinear relationship between scores on the SRES and the AWS. When personality traits were individually regressed on SRES and AWS, SRES scores uniquely accounted for variance in achievement locus of control, and AWS scores uniquely accounted for variance in need for autonomy and need for succorance. Findings were supportive of the viability of sex role egalitarianism as an attitudinal dimension having meaning beyond that of a traditional — feminist dimension.     

Discrimination learning decreases perceived similarity according to an objective measure

Initial identification discriminations between two sizes and between two slants produced better overall performances on subsequent size and slant same-different discriminations, respectively. This size- and slant-specific transfer was due to an improvement on only the different pairs. Time-duration identification discriminations with the identical stimuli and response assignments improved neither overall same-different performances nor performances on different pairs. A good performance on different pairs relative to same pairs should indicate a low perceived similarity. The literature indicates that A-X and B-Y pairings produce a positive transfer on an A-versus-B discrimination when X and Y are relatively low in similarity, and also indicates that a low perceived (not physical) similarity improves discrimination learning. An increase in salience should have also improved performance on the same pairs. The conclusion: the initial discriminations decreased the perceived similarity of parts (size or slant). This decrease resembles perceptual contrast. A discrimination between two parts also seems to increase the extent to which each part is apprehended as a separate group. Therefore, the conclusion accords with the position that two groups are associated with contrast, including for visibility.     

Book reviews

The Psychological Attitude of Early Buddhist Philosophy. Lama Anagarika Govinda, 1991, Delhi, Motilal Banarsidass, Rs 125

The Law of Karma: a philosophical study. Bruce R. Reichenbach, 1990, Honolulu, University of Hawaii Press, pp. xiv + 238, $38.00

Religious Philosophy of Tagore and Radhakrishnan. Harendra Prasad Sinha, 1993, Delhi, Motilal Banarsidass Publishers 188 pp., Rs. 150

Scripture, Canon and Commentary: a comparison of Confucian and Western exegesis. John B. Henderson, 1991, Princeton, NJ, Princeton University Press, xii + 247 pp. $32.50

Chan Insights and Oversights: an epistemological critique of the Chan tradition. Bernard Fauré, 1993, Princeton, NJ, Princeton University Press, ix + 322 pp. £45

Reason and Tradition in Indian Thought: an essay on the nature of Indian philosophical thinking. Jitendra Nath Mohanty, 1992, Oxford, Clarendon Press, 306 pp. £37.50

Avicenna. L. E. Goodman London, Routledge, 1992, xii + 240 pp. £12.99

Becoming Bamboo: Western and Eastern explorations of the meaning of life. Robert E. Carter, 1992, Montreal, McGill‐Queen's University Press, xvi + 224 pp. £22.95     

Letter identification and lateral masking in dyslexic and average readers

Lateral masking and letter identification in dyslexic and average readers were investigated with a methodology that corrected for some of the weaknesses of the Geiger and Lettvin studies (1986, 1987). Target letters were presented alone or embedded within three-letter arrays at retinal locations from 0 degrees to 15 degrees to the right or left of a fixation point. A foveal letter, which was the same as or different from a target letter, appeared as a distractor, and comparisons were made between scaled and unscaled stimuli. Dyslexic readers were found to be better than average readers at detecting scaled letters embedded in an array in some of the peripheral locations tested. Unlike the results of Geiger and Lettvin, however, this finding of better letter detection in the periphery by dyslexics was limited to selected conditions of the study. Reading groups were also found to differ in responding to the foveal distractor in the letter task. Detection of letters by average readers was affected by the type of distractor, but this variable was not found to influence the dyslexic readers. These findings suggest some differences between dyslexic and average readers in attention to stimuli presented at multiple locations in the visual field.     

Conflict over emotional expression: psychological and physical correlates

This study addresses the construct of conflict or ambivalence over emotional expression. Ambivalence is seen as an important mediator in the link between emotional styles and psychological and physical well-being. Using the "personal striving" framework, a questionnaire measure of ambivalent emotional strivings (AEQ) was designed. In Study 1, 292 Ss completed this measure along with questionnaire measures of expressiveness, social desirability, and intense ambivalence. Women scored significantly higher than men on both the AEQ and expressiveness. In Study 2, scores on the AEQ were found to be negatively correlated with self-reported and peer-rated expressiveness. In Study 3, 48 Ss participated in a 21-day study of mood and health. Expressiveness was positively correlated with some measures of well-being and with daily negative affect. Ambivalence was positively correlated with several indices of psychological distress. Although the AEQ correlated with questionnaire measures of physical symptomatology, neither the AEQ nor the expressiveness measures correlated with daily symptom reports. Results support the contention that conflict over emotional expressiveness is a variable worthy of study in its own right, having implications for research on personality and health.     

Religion and health relationships: A review

This review examines various studies showing the relation between religiosity (religious beliefs and/or practices) and health. It also includes church attendance and its relation to drug use. The role of the church in health promotion is discussed, with examples of church intervention model programs. Several attempts have been made to measure religiosity and religious commitment, but as yet little has been done to identify specific dimensions of religion as they relate to health behaviors. Even though the literature indicates that religion is generally associated with health behaviors, health status, and longevity, further research on the specifics of this relationship is needed.He has been doing research on the relation between religion and health for the past five years.