Sleep and waking behaviors change significantly during the adolescent years. The objective of this study was to describe the relation between adolescents' sleep/wake habits, characteristics of students (age, sex, school), and daytime functioning (mood, school performance, and behavior). A Sleep Habits Survey was administered in homeroom classes to 3,120 high school students at 4 public high schools from 3 Rhode Island school districts. Self-reported total sleep times (school and weekend nights) decreased by 40-50 min across ages 13-19, ps 120 min) reported increased daytime sleepiness, depressive mood, and sleep/wake behavior problems, ps < .05, versus those sleeping longer than 8 hr 15 min with less than 60 min weekend delay. Altogether, most of the adolescents surveyed do not get enough sleep, and their sleep loss interferes with daytime functioning.

https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1467-8624.1998.tb06149.x

Sleep Schedules and Daytime Functioning in Adolescents

Published prevalence estimates of nonsuicidal self-injury (NSSI) among nonclinical samples are highly heterogeneous, raising concerns about their reliability and hindering attempts to explore the alleged increase in NSSI over time. Accordingly, the objectives of this study were to investigate the influence of methodological factors on heterogeneity in NSSI prevalence estimates, explore changes over time, and estimate overall international NSSI prevalence. Results showed that methodological factors contributed over half (51.6%) of the heterogeneity in prevalence estimates, and, after adjusting for these factors, NSSI prevalence did not increase over time. Overall, pooled NSSI prevalence was 17.2% among adolescents, 13.4% among young adults, and 5.5% among adults. Clearly, development of standardized methodology in NSSI research is crucial if accurate estimates are desired.

Prevalence of Nonsuicidal Self‐Injury in Nonclinical Samples: Systematic Review, Meta‐Analysis and Meta‐Regression

We argue that additional understanding of work motivation can be gained by incorporating current insights concerning self-categorization and social identity processes and by examining the way in which these processes influence the motivation and behavior of individuals and groups at work. This theoretical perspective that focuses on the conditions determining different self-definitions allows us to show how individual and group processes interact to determine work motivation. To illustrate the added value of this approach, we develop some specific propositions concerning motivational processes underpinning leadership and group performance.

/pdf/motivating-individuals-and-groups-at-work-a-social-identity-400uq5s2s6.pdf

Motivating Individuals and Groups at Work: A Social Identity Perspective on Leadership and Group Performance

OBJECTIVE.The goal was to assess the prevalence, forms, demographic and mental health correlates of self-injurious behaviors in a representative college sample. METHODS.A random sample of undergraduate and graduate students at 2 northeastern US universities were invited to participate in an Internet-based survey in the spring of 2005. Thirty-seven percent of the 8300 invited participants responded. RESULTS.The lifetime prevalence rate of having 1 self-injurious behavior incident was 17.0%. Seventy-five percent of those students engaged in self-injurious behaviors more than once. Thirty-six percent reported that no one knew about their self-injurious behaviors and only 3.29% indicated that a physician knew. Compared with non-self-injurers, those with repeat self-injurious behavior incidents were more likely to be female, bisexual or questioning their sexual orientation. They were less likely to be Asian/Asian American and 24 years of age. When controlling for demographic characteristics, those with repeat self-injurious behavior incidents were more likely to report a history of emotional abuse or sexual abuse, ever having considered or attempted suicide, elevated levels of psychological distress, and 1 characteristic of an eating disorder. A dose-response gradient was evident in each of these areas when single-incident self-injurious behaviors were compared with repeat-incident self-injurious behaviors. CONCLUSIONS.A substantial number of college students reported self-injurious behaviors in their lifetimes. Many of the behaviors occurred among individuals who had never been in therapy for any reason and who only rarely disclosed their selfinjurious behaviors to anyone. Single self-injurious behavior incidents were correlated with a history of abuse and comorbid adverse health conditions but less strongly than were repeat self-injurious behavior incidents. The reticence of these clients to seek help or advice renders it critical that medical and mental health providers find effective strategies for detecting and addressing self-injurious behaviors.

https://cronkitezine.asu.edu/fall2011/selfinjury/pdfs/selfinjury2.pdf

Self-injurious behaviors in a college population.

This article reviews empirical research on the role of follower self-conception in leader-ship effectiveness. and specifies an agenda for future research in this area. The review shows that several aspects of follower self-conception (i.e., self-construal, self-efficacy, self-esteem, and self-consistency) may be affected by leadership. and may mediate the effects of leadership on follower behavior. There also is consistent evidence that follower self-construal moderates the impact of leadership on follower attitudes and behavior. Two key themes for future research are defined. First, future research should focus on the development of theory about the role of relational self-construal in the leadership process. Second, it seems particularly valuable to develop theory about the interplay of different aspects of follower self-conception in leadership effectiveness. including the interactive effects of these aspects of self Working backwards from these theoretical models of follower self-conception, specific leader behavior relevant to these aspects of self should then be identified. (C) 2004 Elsevier Inc. All rights reserved.

/pdf/leadership-self-and-identity-a-review-and-research-agenda-2jjkaw8g5w.pdf

Leadership, self, and identity: A review and research agenda

A sample of 943 adolescents from the general population were questioned about sleep problems. A quarter of the sample reported needing a lot more sleep than they previously had, and 10% of the sample complained of difficulty falling asleep. Adolescents reporting sleep problems showed more anxious, depressed, inattentive, and conduct disorder behaviors than those who had no (or only occasional) sleep problems. Sleep problems, particularly multiple problems, were associated with DSM-III disorder. There were no significant differences between male and female adolescents on any of the above measures. Finally, sleep problems were relatively persistent over time from ages 13 to 15.

Sleep Problems in Adolescence

The present studies were undertaken to investigate the applicability of an information processing approach to human failure in the aircraft cockpit. Using data obtained from official aircraft accident investigation reports, a database of accidents and incidents involving New Zealand civil aircraft between 1982 and 1991 was compiled. In the first study, reports were coded into one of three error stages proposed by Nagel (1988) and for the presence of any of 61 specific errors noted by Gerbert and Kemmler (1986). The importance of decisional factors in fatal crashes was noted. Principal components analysis suggested the presence of five different varieties of human failure. In the second study, a more detailed error taxonomy derived from the work of Rasmussen (1982) was applied to the data. Goal selection errors emerged as the most frequent kind of cognitive error in fatal accidents. Aircraft accident reports can be a useful source of information about cognitive failures if probed with an appropria...

Cognitive failure analysis for aircraft accident investigation

Differences in the strength of endorsement for distributively fair and unfair leaders in interpersonal and intergroup situations were measured. Fair leaders were expected to receive stronger endorsements than unfair leaders in interpersonal situations. This difference, however, was expected to attenuate, if not reverse in intergroup situations when the unfairness favoured the ingroup. An attenuation effect obtained in Experiment 1 (N=49) using ad hoc groups in a laboratory setting. Attenuation and reversal effects obtained, respectively, in Experiments 2 (N=314) and 3 (N=213) using preexisting groups (students and New Zealanders, respectively) in a scenario setting. Fairness ratings followed patterns similar to leadership endorsements in Experiments 2 and 3. Finally, Experiment 3 showed a reversal in participants' private attitudes toward an issue about which the leader expressed an opinion. These data extend previous research on leadership endorsement and are consistent with predictions derived from Social Identity Theory (Tajfel & Turner, 1986). © 1997 John Wiley & Sons, Ltd.

Endorsement of distributively fair and unfair leaders in interpersonal and intergroup situations.

Objective: To examine help-seeking for self-harm in a population-based sample of young adults.Method: Nine hundred and sixty-five participants aged 26 years were interviewed about help-seeking and barriers to help-seeking for a range of self-harmful behaviours. Self-harm included the traditional methods of suicide (ICD-9 self-harm) and other self-harmful behaviours such as self-battery and self-biting.Results: Just over half of the 25 in the ICD-self-harm group (based on ICD-9 self-harm criteria) and one-fifth of the 119 in the other self-harmful behaviour group had sought professional help. Counsellors, psychologists, and general practitioners were the commonest sources of help. Most participants rated help received from health services favourably, however, emergency services were rated less favourably than other health services. Among 77 self-harm participants who did not seek help, just over one-third reported attitudinal barriers.Conclusions: To encourage help-seeking by young adults who self-harm, es...

A population-based study of help-seeking for self-harm in young adults

Based upon a self-categorisation analysis of social influence (Turner, 1991), we predicted that individuals who self-categorise with the source of a communication would align their own private attitudes more closely with the source when that source was distributively fair rather than unfair in an intragroup context. We expected this pattern to reverse in an intergroup context when the unfairness was ingroup favouring. These expectations were confirmed in a laboratory experiment (N=101). The data suggest that neither source similarity nor source fairness serve simply as persuasion cues to which individuals thoughtlessly conform. We argue, instead that, once self-categorised, individuals: (1) actively attend to an ingroup member's behaviours and the context in which they occur, and (2) are influenced only by a source who provides some form of social identity enhancement, either by being fair in an intragroup context (Lind & Tyler, 1988) or ingroup favouring in an intergroup context (Tajfel & Turner, 1986). Copyright © 2000 John Wiley & Sons, Ltd.

Dianne Morrison

Papers

Sleep Problems in Adolescence

Cognitive failure analysis for aircraft accident investigation

Endorsement of distributively fair and unfair leaders in interpersonal and intergroup situations.

A population-based study of help-seeking for self-harm in young adults

The effects of social context, source fairness, and perceived self-source similarity on social influence: A self-categorisation analysis.