Performance variability is related to change in cognition: evidence from the Victoria Longitudinal Study

Performance variability across repeated task administrations may be an important indicator of age-related cognitive functioning. In the present investigation, the authors examined whether age differences and change in inconsistency were related to 6-year (3 occasion) cognitive change. Inconsistency scores were computed from 4 reaction time tasks performed by 446 older adults (54-89 years). Replicating previous cross-sectional results, greater inconsistency was observed for older participants even after controlling for differences in response speed. New longitudinal results demonstrated (a) associations between inconsistency at baseline measurement and 6-year change in cognitive performance; (b) longitudinal change in inconsistency; and (c) intraindividual covariation between 6-year change in inconsistency and 6-year change in level of cognitive function. These findings support the view that performance variability serves as a marker of cognitive aging.     

Book reviews

Confucian Traditions in East Asian Modernity: moral education and economic culture in Japan and the four mini‐dragons Tu Wei‐Ming (Ed.), 1996 Cambridge, MA, Harvard University Press ii + 418pp., hb £28.50, pb £12.50, ISBN 0 674 16086 X (hb)

The Recluse of Loyang: Shao Yung and the moral evolution of early Sung thought Don J. Wyatt, 1996 Honolulu, University of Hawaii Press xii + 340 pp., hb (price not given), ISBN 0 8248 1755 9

Rude Awakenings: Zen, the Kyoto School and questions of nationalism James W. Heisig & John C. Maraludo (Eds), 1995 Honolulu, University of Hawaii Press hb $40.00, pb $19.95

Untying the Knots in Buddhism. Selected essays Buddhist Tradition Series Volume 28, 1997 Alex Wayman 1997 Delhi, Motilal Banarsidass x + 618 pp, hb Rs. 495; ISBN 81 208 1321 9

Historical Dictionary of Hinduism Historical Dictionaries of Religions, Philosophies, and Movements, No. 13 Bruce M. Sullivan 1997 Lanham, MD & London, The Scarecrow Press xviii, 346 pp, pb £46.55, ISBN 0 8108 3327 1

Dictionary of Philosophy and Religion. Eastern and Western thought (New and enlarged edition; first 1980) William L. Reese, 1996 New York, Humanities Press xiv + 856 pp., pb, ISBN 0 391 03864 8     

Ending social encouters

Certain classes of verbal behavior—content summary statements (S_c); affective summary statements (S_a); continuity (C), justification (J), and well-wishing (W) statements; and statements of positive affect (P)—were hypothesized to be constituents of interpersonal endings. These statements are shown to increase during the terminal phase of a social encounter as a function of whether the conversation is between friends or strangers and whether it is structured or unstructured. A hypothesis concerning the sequence in which these five classes of statements will occur during the ending of an interaction, namely, [S_c] → [J] → [_Sa^P] → [C] → [W], is tested and confirmed.     

Social Density and Affiliative Tendency as Determinants of Dormitory Residential Outcomes

The questionnaire responses of both high social density and low social density dormitory residents, divided into high and low groups on affiliative tendency, were examined. Although both high and low affiliates experienced more satisfaction living in low social density dorms, which were associated with higher levels of social interaction than high social density dorms, levels of reported stress varied as a function of both social density and affiliation. High affiliates experienced more, while low affiliates experienced less, stress in the low social density dorm than in the high social density dorm. Results were discussed in terms of the possession of differential coping skills with respect to achieving independence (in the low social density dorm) and dealing with overload from strangers (in the high social density dorm).     

TEACHING LEISURE SKILLS TO SEVERELY HANDICAPPED ADULTS: AN AGE-APPROPRIATE DARTS GAME

This study demonstrates the acquisition and generalization of dart skills by three severely multihandicapped adults. The program took place in a community adult development center. By identifying the motor responses required to play darts, a 7-step task analysis was generated to facilitate instruction. Systematic training procedures using applied behavior analysis were implemented. A combination multiple baseline across subjects and changing criterion design was used. The results indicated that not only could this supposedly difficult skill be acquired by severely multihandicapped individuals, but that they could also generalize to other appropriate environments. Acquisition of this skill could help optimize their use of free time for leisure pursuits in a variety of settings.     

A jackknife test of homogeneity of variance with paired replicates data

A nonparametric test of dispersion with paired replicates data is described which involves jackknifing logarithmic transformations of the ratio of variance estimates for the pre- and post-treatment populations. Results from a Monte Carlo simulation show that the test performs well underH _o and has good power properties. Examples are given of applying the procedure on psychiatric data.A referee called our attention to valuable references which related to our work, and he suggested the inclusion of competing jackknife procedures into our studies.     

Inductive learning by machines

The research described herein has been supported by funding from the Lockheed AI Center and the California MICRO Program. The author would also like to thank Benjamin Grosof, John Pollock, Devika Subramanian, Thomas Dietterich and Steven Muggleton for their valuable comments and suggestions.     

Examining approaches to encourage COVID-19 vaccination on social media

Following the release of the first COVID-19 vaccinations many people utilized social media to promote vaccination among their social circles. These attempts to persuade others to get vaccinated ranged from positive encouragement (e.g., emphasizing the prosocial benefits and positive outcomes) to shame and threats (e.g., name calling and threating to end friendships over vaccination status). The present study investigated how these different social media messages affected COVID-19 vaccination intentions. In June 2021, shortly after vaccines had been made freely available to anyone over the age of 16 in the United States, unvaccinated participants read a manipulated Twitter message designed to be either encouraging or shaming. Message-type did not significantly affect intentions to become vaccinated against COVID-19; however, participants who saw the encouraging message reported that the post made them feel more likely to get vaccinated. Self-efficacy was also manipulated but did not reveal any significant effects. Additional analyses suggest that having personal experience with COVID-19 moderates reactions to these different messages. We discuss limitations and promising avenues for future research on the effects of social media messages on health behaviors.     

The control of alcohol-related aggression: Redirecting the inebriate's attention to socially appropriate conduct

Forty male undergraduates ingested either a high dose of alcohol or a placebo, and were either provided with a nonaggressive norm or not, prior to being provoked by an opponent during a competitive reaction time task. Aggression was assessed by the intensity of shocks administered by the subject to the bogus opponent. Results suggest that the provision of an explicit nonaggressive norm enabled highly intoxicated subjects to moderate their aggressive responding even in a highly competitive situation. These findings are discussed in terms of current cognitive disruption models of alcohol-related aggression which assume intoxicated persons are unable to process information concerning appropriate standards of conduct.