The internal clock: evidence for a temporal oscillator underlying time perception with some estimates of its characteristic frequency

Evidence for the proposition that human time perception is determined by an internal clock is largely indirect. It would strengthen the case for this hypothesis if a model for the internal clock were available from which predictions could be derived and tested, and if the basic parameter of such a model, the frequency at which the clock runs, could be estimated. A model for an internal temporal pacemaker is briefly described and its properties are explored by computer simulation. Results are obtained that provide a basis for predicting that, under appropriate conditions, interference between an imposed rhythm and the frequency of a temporal oscillator may cause perturbations in temporal judgment which are related to the characteristic frequency of that oscillator. Experimental data are reported which appear to demonstrate such an interference pattern. These results allow some estimates of the characteristic frequency of the temporal oscillator to be obtained.     

African American Adolescent-Caregiver Relationships in a Weight Loss Trial

Successful family-based weight loss interventions for African American adolescents are rare. Parent-adolescent interactions supporting adoption of healthier nutrition and physical activity practices are not well understood. African American caregivers' and adolescents' perspectives on how they worked together to achieve weight loss need further exploration. This study describes the relationships experienced by adolescents and caregivers during the 6-month, evidence-based FIT Families weight loss trial and explores differences between families whose adolescents were successful and unsuccessful with weight loss. Exit interviews conducted with 136 adolescents (age 12–16 years; BMI percentile ≥95) and their caregivers (primarily mothers) were taped and transcribed verbatim. Content and thematic analysis was conducted to explore differences between groups stratified by weight loss. Five adolescent-caregiver relationship patterns emerged which describe dyads working together, working alone, working against each other; caregiver support and caregiver working on self. When relationship patterns were compared between groups stratified by weight loss, three themes emerged: motivation, support, and persistence. Families that achieved the greatest weight loss referred more often to working together to reach weight loss goals, attributed their success to adolescent self-motivation, with engaged caregiver support which allowed families to persist in change efforts. Family relationships involving adolescent autonomy, engaged parental support, and persistence despite challenges, clustered differently among adolescents who were successful at weight loss compared to those who were not. Interventionists trained to reinforce effective adolescent-parent interactions will advance behavioral interventions for families who have typically benefited least in prior interventions.     

Time perception and the internal clock: Effects of visual flicker on the temporal oscillator

Abstract

Our ability to estimate time intervals has sometimes been attributed to a biological source of temporal information. A model for a temporal oscillator that provides such information has recently been described (Treisman, Faulkner, Naish & Brogan, 1990). This predicts that an imposed stimulus rhythm at certain frequencies may interfere with the temporal oscillator so as to alter its frequency. This interference would cause perturbations in temporal judgements at certain frequencies of the imposed rhythm. The pattern of interference would depend on the frequency at which the temporal oscillator runs, and so would contain information about the oscillator frequency. Evidence for such a pattern was found when auditory clicks at different rates were presented concurrently with time intervals whose durations subjects estimated. The present study examines whether a similar interference pattern can be obtained if visual flicker is substituted for auditory clicks. On each trial, flicker was presented at a rate between 2.5 and 17.5 Hz, concurrently with a time interval to be estimated. A pattern of increased estimates at some rates and decreased estimates at others was obtained. This pattern showed similarities to interference patterns obtained using auditory clicks. This provides evidence that the entrainment of the internal clock predicted by the model can also be produced by visual inputs. Other theoretical implications are discussed.     

成人日常问题解决的老化研究

日常问题解决能力是近十几年来老年心理学中研究比较活跃的一个领域。本文介绍了有关日常问题解决研究的四种理论,即心理测量的智力内隐理论、形式后思维的辨证思维理论、信息加工理论和社会认知与智慧理论,及其初步的研究成果,并进一步指出在理论上整合和在实践中开展干预的研究方向。     

Problems of colleagueship for women entering the medical profession

Women students enrolled in two southern medical schools in 1975–1976 were found to be just as likely as their male peers to hold an unfavorable attitude toward other women medical students or to be unsure about how they felt. Although one medical school had organized a support group for women, 37% of the women students were reluctant to associate with the group. More positive relationships between women students and male peers may follow an increase in the percentage of women medical students, but positive relationships among women students themselves may depend on the latter's ability to successfully resolve sex-role identity concerns.This research was supported by Grant HS01924 from the National Center for Health Services Research. The authors wish to acknowledge Heather Gray and Richard Dixon for interviewing assistance.     

Sources of Sex Discrimination in Educational Systems: A Conceptual Model

A conceptual model is presented which relates numerous variables believed to contribute to sexism in American education. Discrimination is viewed as intervening between two sets of interrelated independent variables and the dependent variable of sex inequalities in educational attainment. The two sets of independent variables are 1) internal psychological-cognitive structures of individuals who participate in the educational system, and 2) the educational system itself. Six internal psychological-cognitive structures are emphasized: sex-role orientation, sex difference stereotypes, ego strength, self-concept, and educational and occupational expectations. Sex-role orientation changes are viewed as the key to significant change in the total system described by the model.     

Family caregivers of older relatives: ways of coping and change in distress

The aim of this secondary analysis was to examine the relationships between the ways in which caregivers coped with caregiving stressors and their experience of distress over time. Three coping subscales were derived from the Carers' Assessment of Management Index (CAMI) coping scale: "maintaining balance", "focusing on caregiving" and "avoidance". A proportional (relative) scoring technique was applied. The analysis was based on the responses of 115 pairs of caregivers and care recipients. Care recipients were aged 66-92 years, with no symptoms of dementia, and the majority had mild to moderate hearing impairment. Data were collected at baseline and 6 months later. Caregivers who increased the proportion of strategies endorsed in the "maintaining balance" subscale experienced a decrease in distress, irrespective of change in the proportion of strategies endorsed in the "avoidance" subscale. "Focusing on caregiving" was not significantly related to distress. The results highlight the potential benefits to these caregivers of maintaining a balance in their lives by taking breaks from caregiving.