Neurocognitive correlates of white matter quality in adolescent substance users

Background

Progressive myelination during adolescence implicates an increased vulnerability to neurotoxic substances and enduring neurocognitive consequences. This study examined the cognitive manifestations of altered white matter microstructure in chronic marijuana and alcohol-using (MJ + ALC) adolescents.

Methods

Thirty-six MJ + ALC adolescents (ages 16–19) and 36 demographically similar controls were evaluated with diffusion tensor imaging (Bava et al., 2009) and neurocognitive tests. Regions of group difference in fractional anisotropy (FA) and mean diffusivity (MD) were analyzed in relation to cognitive performance.

Results

In users, lower FA in temporal areas related to poorer performance on attention, working memory, and speeded processing tasks. Among regions where users had higher FA than controls, occipital FA was positively associated with working memory and complex visuomotor sequencing, whereas FA in anterior regions was negatively associated with verbal memory performance.

Conclusions

Findings suggest differential influences of white matter development on cognition in MJ + ALC using adolescents than in non-using peers. Neuroadaptation may reflect additive and subtractive responses to substance use that are complicated by competing maturational processes.     

What Studies of Actors and Acting Can Tell Us About Memory and Cognitive Functioning

ABSTRACT— The art of acting has been defined as the ability to live truthfully under imaginary circumstances. Our many years of researching theatrical expertise have produced findings relevant to text comprehension, learning theory, cognitive aging, and expert memory. In this article, we first discuss how large amounts of dialogue, learned in a very short period, can be reproduced in real time with complete spontaneity. We then turn to abstracting the essence of acting and applying it to diverse undertakings, from discovering optimal learning strategies to promoting healthy cognitive aging. Finally, we address the implications of acting expertise on current theories of embodied cognition.     

What are television advertisements really trying to tell us? A postmodern perspective

This paper differentiates between the modern and the postmodern approach to advertising. It provides indicators of the nature of postmodern advertisements and proposes a methodology based on critical discourse analysis for interpreting the meaning and understanding the structure of such advertisements. The paper discusses the purpose of the postmodern approach to advertising and argues that its very imagery may further confuse an already confused postmodern consumer. The credibility of the imagery may also be questioned where it is perceived to be an illusion that is incapable of being substantiated. Copyright © 2002 Henry Stewart Publications.     

'Experiencing' Alpha: Finding and Embodying the Spirit and Being Transformed--Empowerment and Control in a ('Charismatic') Christian Worldview

This article analyses the Alpha Course, the 15-session evangelising programme designed by Holy Trinity Brompton. It argues that it is a popular form of evangelism influenced by the 'charismatic' movement, which aims to initiate participants into a particular religious 'experience'. It further argues that the course aims to stimulate participants to locate themselves, psychologically and socially, within a 'charismatic' worldview. The article aims to examine, phenomenologically, the Alpha 'experience', through an ethnographic analysis of the course and in particular its Holy Spirit weekend. The article relates Alpha to the wider beliefs and practices of the 'charismatic' movement and religious experience and assesses what it means for contemporary Christianity. It seeks to show that the initial 'experience' gained on the Alpha Course is continued within 'charismatic' experience in church meetings and services and looks at the personal empowerment and social control that may be at work.     

Coping and Psychological Distress as a Function of the Bully Victim Dichotomy in Older Children

While it has been well established that bullying and being bullied have negative psychological consequences for children, the more recent literature has suggested a more complex relationship based on social cognition. A debate has arisen as to whether bullies have deficits or strengths in social cognition. In a study of 236 children (112 males and 124 females) aged between 12 and 15 years the current research explored three main aspects of social cognition, problem-solving style, perceived control and optimism in both bullies and victims. The findings suggest that the debate may hinge on whether the bullies are also victims. In this study bullies had higher scores on problem-solving control while bully victims had the lowest scores. These variations corresponded to differences in psychological distress suggesting that bullies may have developed more effective coping strategies with the reverse being true for bully victims     

Physical self-presentation and competitive anxiety in male master divers

This study investigated the link between physical self-presentation and competitive anxiety in male, master-level, high-board divers (N=84, M age = 29.3 yr., SD = 14.3). Competitive trait anxiety, social physique anxiety, and physical self-presentation confidence were assessed using the Sport Anxiety Scale, Social Physique Anxiety Scale, and the Physical Self-presentation inventory. Stepwise regression analyses indicated that variance in competitive anxiety was accounted for by the physical self-presentation variables and that these variables were more strongly associated with the cognitive anxiety subscale Worry, and to a lesser extent, Somatic Anxiety. The results of this study provide support for the argument that physical self-presentation is associated with competitive anxiety in male athletes.     

Relationship between team identification and trait aggression: a replication

Research yielded no significant relationship between sport fandom and trait aggression. The current study replicated previous efforts using the Buss-Perry Aggression Questionnaire, an updated version of the Buss-Durkee Hostility Inventory. In contrast to past work, the current study did yield a significant relationship between fandom and aggression for men.     

fMRI of developmental stuttering: a pilot study

The purpose of this investigation was to explore the feasibility of fMRI in the study of developmental stuttering. Speech contrasts (loud versus silent reading) and language contrasts (reading of semantically meaningful text versus nonsense words) of six developmental stutterers and six nonstutterers were compared using a commercial 1 Tesla MR-Scanner (Siemens Expert). Results indicate that mapping cortical function in persons who stutter is indeed feasible, even with a 1TMR-system. Compared to normals the stutterers seemed to employ different and particularly less differentiated auditory and motor feedback strategies in speech. They apparently rely on auditory processing and on cerebellar contribution as much during silent reading as during reading aloud. Moreover, they showed a greater involvement of the right hemisphere in language processing, activating not only the typical language areas on the left but also and with equal magnitude the right side homologues of these areas. In spite of the promising results, at present several practical problems such as possible movement artifacts and possible masking through scanner noise still hamper a more straightforward use of fMRI in the study of developmental stuttering.