Performance monitoring in a confusing world: error-related brain activity, judgments of response accuracy, and types of errors

The error-related negativity (ERN) represents a neural response, recorded from scalp electrodes, that is associated with monitoring activities. It is most likely generated in the anterior cingulate cortex (ACC). Measures of the ERN, and of behavioral and perceived accuracy, were obtained from participants while they performed a visual 2-choice reaction time task under degraded stimulus conditions. Irrespective of behavioral accuracy, the amplitude of the ERN (measured at the time of the response) covaried with the perceived inaccuracy of the behavior (measured at the end of the trial). Errors due to premature responding (errors perceived as errors) were associated with large ERNs. Errors due to data limitations (errors about which there was uncertainty) were associated with smaller ERNs. These and other results are consistent with the proposal that performance monitoring, as manifested by the ERN, involves a comparison between representations of the appropriate response and the response actually made.     

Examination of psychiatric symptoms in student athletes

In the present study, the authors examined the severity of psychiatric symptoms in undergraduate recreational (noncompetitive) athletes (n = 64) and National Collegiate Athletic Association (NCAA; competitive) athletes (n = 72). The results indicated that the 2 groups were similar in the severity of psychiatric symptoms. The recreational and NCAA athletes combined (n = 136) showed less severe global psychiatric symptoms when they were compared with an undergraduate control group (n = 435). The implications of the study are discussed in the context of those findings.     

Effects of Interspersing Rate on Student Preferences for Mathematics Assignments

This study investigated the extent to which interspersing effects are consistent with the effects of reinforcement on predicting students preferences for mathematics assignments. Students were exposed to 4 pairs of assignments. Each assignment pair contained a control assignment with 15 problems requiring multiplication of a three digit number by a two digit number, and an experimental assignment consisting of 15 similar multiplication problems plus additional brief one-digit by one-digit multiplication problems interspersed at four different rates (i.e., no interspersing, every other, every third, or every fifth problem) across assignment pairs. Performance data were collected for accuracy, total problem completion rate and target problem completion rate. In addition to performance data, students were asked to rate each assignment with regard to relative difficulty, time, effort to complete, and preference between assignments for homework. Results suggest that although interspersing rates do not affect accuracy, they do affect problem completion rate, and student preferences for academic assignments. Discussion focuses on interspersing rate and schedules of reinforcement with emphasis on both applied and theoretical implications.     

A NEURAL SYSTEM FOR ERROR DETECTION AND COMPENSATION

Abstract— Humans can monitor actions and compensate for errors. Analysis of the human event-related brain potentials (ERPs) accompanying errors provides evidence for a neural process whose activity is specifically associated with monitoring and compensating for erroneous behavior. This error-related activity is enhanced when subjects strive for accurate performance but is diminished when response speed is emphasized at the expense of accuracy. The activity is also related to attempts to compensate for the erroneous behavior.     

Telephone versus print delivery of an individualized motivationally tailored physical activity intervention: Project STRIDE.

OBJECTIVE: Given that only 25% of Americans meet physical activity recommendations, there is a need to develop and disseminate effective, evidence-based interventions to promote physical activity. The authors tested 2 delivery channels, telephone and print, to determine whether one was more effective in promoting physical activity. DESIGN: The authors randomly assigned 239 healthy, sedentary adults to (a) telephone-based individualized feedback, (b) print-based individualized feedback, or (c) contact control. Both intervention arms were guided by a motivationally tailored, theoretically driven computer expert system. MAIN OUTCOME MEASURES: Physical activity as measured by the 7-day Physical Activity Recall interview. RESULTS: At 6 months, both telephone and print arms significantly increased in minutes of moderate intensity physical activity compared with control, with no differences between the intervention arms. At 12 months, print participants reported a significantly greater number of moderate intensity minutes than both telephone and control participants, who did not differ. CONCLUSION: Results suggest that both telephone and print enhance the adoption of physical activity among sedentary adults; however, print interventions may be particularly effective in maintaining physical activity in the longer term.     

Ongoing physical activity advice by humans versus computers: the Community Health Advice by Telephone (CHAT) trial.

PURPOSE: Given the prevalence of physical inactivity among American adults, convenient, low-cost interventions are strongly indicated. This study determined the 6- and 12-month effectiveness of telephone interventions delivered by health educators or by an automated computer system in promoting physical activity. DESIGN: Initially inactive men and women age 55 years and older (N = 218) in stable health participated. Participants were randomly assigned to human advice, automated advice, or health education control. MEASURES: The validated 7-day physical activity recall interview was used to estimate minutes of moderate to vigorous physical activity. Physical activity differences by experimental arm were verified on a random subsample via accelerometry. RESULTS: Using intention-to-treat analysis, at 6 months, participants in both interventions, although not differing from one another, showed significant improvements in weekly physical activity compared with controls. These differences were generally maintained at 12 months, with both intervention arms remaining above the target of 150 min per week of moderate to vigorous physical activity on average. CONCLUSION: Automated telephone-linked delivery systems represent an effective alternative for delivering physical activity advice to inactive older adults.     

Textbooks for teaching the anthropology of religion: a review

Written from the perspective of those who teach the anthropology of religion, the paper reviews a selection of texts commonly used in teaching. The authors find the texts are generally useful, although those written clearly and with good cross-referencing detail (index, bibliography, overviews) are the most helpful. One major finding is the range of views over what might constitute 'textbook’ - itself a fairly contested term more widely.     

Object and size awareness in preschool-age children

Self-awareness is a skill developed during the first few years of life. Although some research demonstrates that this ability may be incomplete in toddlers, there is little to no literature relating to preschoolers. This study tested 44 preschool-age children on 8 tasks to assess their awareness of the structural characteristics of their own size and weight as well as the size and weight of external objects. The most frequently observed behavior was for children to make an attempt at something that was inappropriate for their size and weight, but overall participants showed a better understanding of their own bodies than other objects. Both the number of attempts required to solve the problems and accuracy of their solutions demonstrated these task differences. These results indicate that the development of body awareness skills is far from complete for 3- and 4-year-olds.     

Correlates of satisfaction with body function and body appearance in middle- and older aged adults: The activity counseling trial (ACT)

Abstract

This study examined the dimensional structure and correlates of body satisfaction among middle-aged and older adult men (n = 471) and women (n = 383) who were participants in the Activity Counseling Trial. Correlates were grouped as (1) fitness parameters, (2) demographic characteristics, and (3) components of subjective well-being. Factor analyses demonstrated that body function and body appearance were independent components of satisfaction in this population. Body composition and cardiorespiratory fitness were directly related to satisfaction with body appearance; however, satisfaction with body function was most strongly related in expected directions to measures of subjective well-being. Age was positively related to both measures of body satisfaction, whereas data on race revealed that blacks were more satisfied with their body appearance and function than whites. The observed relationships for body satisfaction suggest that older adults may value body function more than body appearance. Furthermore, the associations of race and age with body satisfaction have important implications for intervention research.