Slow wave sleep during a daytime nap is necessary for protection from subsequent interference and long-term retention

While it is now generally accepted that sleep facilitates the processing of newly acquired declarative information, questions still remain as to the type and length of sleep necessary to best benefit declarative memories. A better understanding could lend support in one direction or another as to the much-debated role of sleep, be it passive, permissive, or active, in memory processing. The present study employed a napping paradigm and compared performance on a bimodal paired-associates task of those who obtained a 10-min nap, containing only Stages 1 and 2 sleep, to those whose nap contained slow-wave sleep (SWS) and rapid eye movement (REM) sleep (60-min nap), as well as to subjects who remained awake. Measurements were obtained for baseline performance at training, after a sleep/no sleep interval for short-term retention, after a subsequent stimulus-related interference task, and again after a weeklong retention period. While all groups learned the information similarly, both nap groups performed better than the Wake group when examining short-term retention, approximately 1.5h after training (10-min p=.052, 60-min p=.002). However, performance benefits seen in the 10-min nap group proved to be temporary. Performance after a stimulus-related interference task revealed significantly better memory retention in the 60-min nap group, with interference disrupting the memory trace far less than both the Wake and 10-min nap groups (p<.001, p=.006, respectively). After a weeklong retention period, sleep's benefit to memory persisted in the 60-min nap group, with performance significantly greater than both the Wake and 10-min nap groups (p<.001, p=.004, respectively). It is our conclusion that SWS, obtained only by those in the 60-min nap group, served to actively facilitate the consolidation of learned bimodal paired-associates, supported by theories such as the Standard Theory of Consolidation as well as the Synaptic Homeostasis Hypothesis.     

Effects of Exposure to Sexual Content in the Media on Adolescent Sexual Behaviors: The Moderating Role of Multitasking with Media

Young audiences frequently combine media use (e.g., television viewing) with other activities (e.g., homework); this is referred to as multitasking. This research uses longitudinal data to examine the moderating role of multitasking by examining the effects of exposure to sexual content in the media on adolescents' sexual behavior. Consistent with the predictions based on the limited capacity approach, there was a significant multitasking by exposure interaction suggesting that multitasking reduces the impact of media. More specifically, the effect of exposure to sexual content in the media on sexual behavior was significantly greater among light multitaskers than among heavy multitaskers.     

The Influence of Personality on Workplace Bullying and Discrimination

This study explored the similarity of underlying personality traits of workplace bullying and discrimination. University students self-reported the frequency of bullying others in the workplace and discriminating against African Americans, homosexuals, and the obese. They completed questionnaires measuring prejudice and personality traits. The major findings were that social dominance orientation, low social desirability scores, and being male affected bullying and discrimination. Perspective taking affected bullying; and right-wing authoritarianism, anxiety, and being White affected discrimination. Prejudice influenced relations between personality and discrimination, but not bullying. It was concluded that despite strong behavioral similarities, bullying and discrimination have somewhat different underlying determinants. Certain traits make them distinct, increasing the likelihood of one choosing either a prejudice-based target or a non-prejudice-based target.     

Relative salience of syllable structure and syllable order in zebra finch song

There is a rich history of behavioral and neurobiological research focused on the ‘syntax’ of birdsong as a model for human language and complex auditory perception. Zebra finches are one of the most widely studied songbird species in this area of investigation. As they produce song syllables in a fixed sequence, it is reasonable to assume that adult zebra finches are also sensitive to the order of syllables within their song; however, results from electrophysiological and behavioral studies provide somewhat mixed evidence on exactly how sensitive zebra finches are to syllable order as compared, say, to syllable structure. Here, we investigate how well adult zebra finches can discriminate changes in syllable order relative to changes in syllable structure in their natural song motifs. In addition, we identify a possible role for experience in enhancing sensitivity to syllable order. We found that both male and female adult zebra finches are surprisingly poor at discriminating changes to the order of syllables within their species-specific song motifs, but are extraordinarily good at discriminating changes to syllable structure (i.e., reversals) in specific syllables. Direct experience or familiarity with a song, either using the bird’s own song (BOS) or the song of a flock mate as the test stimulus, improved both male and female zebra finches’ sensitivity to syllable order. However, even with experience, birds remained much more sensitive to structural changes in syllables. These results help to clarify some of the ambiguities from the literature on the discriminability of changes in syllable order in zebra finches, provide potential insight on the ethological significance of zebra finch song features, and suggest new avenues of investigation in using zebra finches as animal models for sequential sound processing.     

Measuring the Time Teens Spend with Media: Challenges and Opportunities

Abstract

This article considers the challenges researchers face in attempting to measure the amount of time teenagers spend with media. After reviewing the methods and measures that have been used in research incorporating “time spent with media” as a critical variable, it concludes that there is a lack of information about the reliability and validity of these measures and highlights the challenges that face researchers in this domain. In particular, there has been little comparison of the different self-report measures commonly used to capture media time. Moreover, little effort has been made to explore differences in media time use measures across the variety of media available today. Finally, we argue that teens are a unique audience for media and that their media use patterns may be distinct. To address these and other issues, data from 2 exploratory studies are presented. Study 1, a self-administered questionnaire with 191 youth ages 12 to 19, examines the correlation of an ordinal-level Frequency measure with a continuous Minutes per Week measure and finds important differences within and across the media used by teens. Study 2, a survey of 86 youth ages 12 to 18 conducted in a focus-group format, examines the correlation of responses to a cued-recall measure (a TV grid) and a media time use log (a diary in 30-min time blocks). Respondents’ reports of time spent with television from the TV grid were significantly greater than those from the time-use log. The article concludes with suggestions for future research needed to better understand teenagers’ time with media in the new media environment.     

The Role of Desires,Self-Predictions,and Perceived Control in the Prediction of Training Session Attendance1

Employee attendance at a training session was examined using the theory of reasoned action (Fishbein & Ajzen, 1975). In addition, based on Audi (1973a, b) and Warshaw and Davis (1985), a distinction was made between desires (I want) and behavioral self-predictions (I will), and as in Ajzen (1985, 1987), the role of perceived control as a determinant of these desires, self-predictions, and attendance behavior, per se, was investigated. The results indicated that the best predictors of attendance at the training session were one's desire or motivation to attend the training session and the extent to which one perceived pressure from his or her supervisor to do so. Consistent with the theory of reasoned action, the motivation to attend training was predicted accurately from attitudes and subjective norms (R=.76, p < .001). Moreover, these attitudes and subjective norms were themselves predicted from a consideration of behavioral and normative beliefs, and key beliefs underlying one's desire to attend were identified. However, a consideration of perceived control did not improve the prediction of one's desire to attend training, and neither perceived control nor behavioral self-predictions improved prediction of actual attendance. The discussion focused on the roles of perceived control and different measures of intention in behavioral prediction.     

The Relation Between Perceived Risk and Preventive Action: A Within-Subject Analysis of Perceived Driving Risk and Intentions to Wear Seatbelts

Intentions to wear seatbelts in 12 different driving situations were predicted from attitudes toward wearing seatbelts, subjective norms concerning seatbelt uses, and perceived driving risk. In a given driving situation, appropriate measures of attitudes and subjective norms both had significant effects on intentions to wear a seatbelt, whereas there was little relation between risk and intentions. Intentions across the 12 driving situations were significantly related to perceived driving risk, both for aggregate data and for a substantial portion of individual subjects. However, further analyses indicated that risk seemed to affect intentions indirectly through subjective norms and attitudes associated with seat-belt use. The results suggest that attempts to increase seatbelt use should target all relevant beliefs important in determining people's attitudes toward and subjective norms concerning seatbelt use, rather than just focusing upon making people aware of the risks associated with driving.     

Using an AIDS KABP Survey to Identify Determinants of Condom Use Among Sexually Active Adults From St. Vincent and The Grenadines1

In Fall 1990, a knowledge, attitude, belief, and practices (KABP) survey was administered to a representative sample of residents of St. Vincent and the Grenadines, an island nation in the Eastern Caribbean. The KABP questionnaire contained a large number of questions that could reasonably be expected to be related to whether or not people use condoms. To a certain extent, each of these questions can be viewed as an attempt to assess one of the variables identified by one or more theories of behavior and behavior change. More specifically, questions on the KABP were identified as possible indicants of AIDS knowledge, cues to action, perceived susceptibility, perceived severity, perceived (locus of) control, perceived normative pressure, and condom use outcome expectancies. Statistical analyses indicated that some, but not all, of these variables were related to condom use among sexually active adults. In particular, the analyses indicated that perceived normative pressure to use condoms was the single most important determinant of condom use behaviors on St. Vincent. The implications of this finding for designing mass-media campaigns to increase condom use is discussed, and a campaign that attempts to change condom use by influencing perceived social norms is strongly recommended.