Why do adolescents use drugs? A common sense explanatory model from the social actor's perspective

Analysis was made of the common sense explanations of 60 Mexican teenage illicit drug users in rehabilitation to determine their drug use debut. The explanatory model was separated into three blocks, two of which contained common sense aspects: interaction between subject's plane and the collectivity; and relationship between subject's interior (subject-family) and exterior (environment or group-pressure). Based on these data, we propose that drug use debut may be linked to subjects' emotional vulnerability which originates in the family image and renders them more susceptible to the influence of others. This kind of reasoning points to a more passive than active, and more social than personal dynamic in drug use debut, important factors for developing preventative measures.     

Democratizing TV?

Television and the Crisis of Democracy, by Douglas Kellner, Boulder, Co: Westview, 1990, 287 pages, hb £17.95, pb £10.95     

Sleep Symptoms as a Partial Mediator Between Combat Stressors and Other Mental Health Symptoms in Iraq War Veterans

Sleep symptoms are a prominent feature of mental health disorders like PTSD and depression. However, it is unknown whether sleep symptoms mediate the relationship between combat stress and these disorders. We examined the mediating role of sleep symptoms on the relationship between combat stress and PTSD; and the relationship between combat stress and depression using data from 576 Army veterans of the Iraq War surveyed in 2004. Correlational analyses revealed that when insomnia was included in the model, the correlation between combat stressors and other depression symptoms decreased by 65%; and when nightmares were included in the model, the correlation between combat stressors and other PTSD symptoms decreased by 69%. We replicated these analyses using individual items assessing PTSD and depression and found that the insomnia and nightmare items had the largest and second largest mediation effect between combat stressors and PTSD and depression symptoms. Our result support the theory that sleep symptoms contribute to the development and/or maintenance of other mental health symptoms and that early treatment of sleep symptoms may mitigate the other mental health consequences of combat stress.     

Double bisection of auditory temporal intervals by humans

Scalar Expectancy Theory (SET) has been the leading theory in timing research, and has also influenced research into human timing. However, other timing theories exist, such as Learning to Time (LeT). The double bisection task was designed to test the SET and LeT theories in pigeons. The purpose of this experiment was to verify whether similar results emerge from a human adaptation of the double bisection task. The results indicated that humans perform the double bisection task in the same way as pigeons do. However, the assumptions inherent in LeT cannot be applied to humans. Two other explanations are also assessed here.     

纯粹道德学说与人类学——对康德先天有效的普遍实践法则的批判思考

康德伦理学的主旨自然是要为人类行为提供一条先天有效的普遍实践法则,以回答"我该做什么"这一中心议题.为了保证实践法则的普遍有效性,康德提出伦理学必须排除一切来自心理学和人类学的东西,伦理学的原理绝对不能建立在经验人类学基础上,于是,在纯粹道德学说的先验形而上学和经验人类学之间作出严格分离.按康德自己的说法是:纯粹道德学说不可建立在人类学上,但它能够而且必须运用到人类学上.作者在这里主要指出了康德晚年出版的一部重要伦理学文献:《伦理的形而上学》,这部书的意义尤其在我国没有得到应有的重视,处在许多康德伦理学研究者的视野之外,是造成某些片面理解的原因之一.翻译弗尔施纳这篇文章的意义在于有利于我们完整地考虑康德伦理学思想的系统布局,消除不必要的对康德的一些误解.     

Individual differences in chronically defeated male mice: behavioral, endocrine, immune, and neurotrophic changes as markers of vulnerability to the effects of stress

This study aimed to analyze different behavioral profiles in response to chronic social defeat using the sensorial contact model. We hypothesized that a passive profile, unlike an active one, would be associated with behavioral and physiological characteristics related to depression. Six-week-old OF1 male mice were subjected to defeat for 21 consecutive days. A combination of cluster and discriminant analyses of the behavior exhibited during confrontation on Day 21 established two behavioral profiles: active (n?=?22) and passive (n?=?34). Passive mice, with a high level of immobility and low non-social exploration, had higher plasma corticosterone concentrations than active mice after 21 days of defeat. Three days after the last defeat, passive mice had lower corticosterone levels than manipulated-control mice (n?=?11). Higher levels of interleukin-6 and tumor necrosis factor-α (TNF-α) in the spleen and lower hippocampal brain-derived neurotrophic factor levels were observed in passive mice in comparison with those in active mice and the manipulated controls. The only differences observed in active mice in relation to the manipulated control were higher plasma corticosterone (Day 21) and TNF-α levels. The results show that different behavioral profiles in response to chronic defeat are associated with different physiological profiles, and that the passive profile presents physiological characteristics previously associated with depression.     

When do motor behaviors (mis)match affective stimuli? An evaluative coding view of approach and avoidance reactions

Affective-mapping effects between affective stimuli and lever movements are critically dependent upon the evaluative meaning of the response labels that are used in the task instructions. In Experiments 1 and 2, affective-mapping effects predicted by specific-muscle-activation and distance-regulation accounts were replicated when the standard response labels towards and away were used but were reversed when identical lever movements were labeled downwards and upwards. In Experiment 3, affective-mapping effects were produced with affectively labeled right and left lever movements that are intrinsically unrelated to approach and avoidance. Experiments 4 and 5 revealed that affective-mapping effects are not mediated by memory retrieval processes and depend on the execution of affectively coded responses. The results support the assumption that evaluative implications of action instructions assign affective codes to motor responses on a representational level that interact with stimulus evaluations on a response selection stage.     

On the interplay between familiarity and emotional expression in face perception

Traditional models of face perception (e.g. Bruce and Young 1986) stress independent routes for processing identity and emotional expression. We investigated the interplay between familiarity and emotional expression by systematically varying both factors. In contrast to earlier studies which used binary forced-choice decisions, participants had to judge the familiarity of the presented face and the emotional hedonic valence and emotional arousal of its expressed emotion (angry, happy or neutral), using rating scales. The results demonstrated symmetric, strong interactions between familiarity and expressed emotion. Thus, this study supports more recent models of face perception (Haxby et al. 2000) that were mostly based on brain imaging data. These data together with our behavioural results emphasize the interaction of emotional expression and personal identity and support approaches that propose a relative segregation of these processes, rather than completely independent coding (Calder and Young 2005).     

Social representations used by the parents of Mexican adolescent drug users under treatment to explain their children's drug use: gender differences in parental narratives

The aim of this study was to explore the social representations used by the parents of adolescent drug users to explain the onset of drug use. Differences in explanations between the parents of male and female adolescents were also explored. Sixty parents who accompanied their children to four rehabilitation centers in 2004 completed two semi-structured questionnaires. In addition, indepth interviews were applied to a subsample. The explanation of the drug use was carried out through two social representations: the neglectful family and the son or daughter as an inexperienced teen. The parents-son model was well structured; however, the parents-daughter was unstructured, which suggests a higher resonance in the familial group.