Vitamins, minerals, and mood

In this article, the authors explore the breadth and depth of published research linking dietary vitamins and minerals (micronutrients) to mood. Since the 1920s, there have been many studies on individual vitamins (especially B vitamins and Vitamins C, D, and E), minerals (calcium, chromium, iron, magnesium, zinc, and selenium), and vitamin-like compounds (choline). Recent investigations with multi-ingredient formulas are especially promising. However, without a reasonable conceptual framework for understanding mechanisms by which micronutrients might influence mood, the published literature is too readily dismissed. Consequently, 4 explanatory models are presented, suggesting that mood symptoms may be expressions of inborn errors of metabolism, manifestations of deficient methylation reactions, alterations of gene expression by nutrient deficiency, and/or long-latency deficiency diseases. These models provide possible explanations for why micronutrient supplementation could ameliorate some mental symptoms.     

The roles of encoding,retrieval, and awareness

In the experiment reported here, we examined the processes by which expected (probable) changes are detected more frequently than are unexpected (improbable) changes (the change probability effect; Beck, Angelone, & Levin, 2004). The change probability effect may be caused by a bias toward probable changes during encoding of the prechange aspect, during retrieval of the prechange aspect, or during activation of an explicit response to the change. Participants performed a change detection task for probable and improbable changes while their eye movements were tracked. Change detection performance was superior for probable changes, but long-term memory performance was equivalent for both probable and improbable changes. Therefore, although both probable and improbable prechange aspects were encoded, probable prechange aspects were more likely to be retrieved during change detection. Implicit change detection was also greater for probable changes than for improbable changes, suggesting that the change probability effect is the result of a bias during the retrieval and comparison stage of change detection. The stimuli used in the change detection task may be downloaded from www.psychonomic.org/archive.     

What Is It Like To Be in the Minority? Ethnic and Gender Diversity in the Genetic Counseling Profession

Increasingly, the genetic counseling profession is recognizing the need for greater ethnic and gender diversity. Recruitment and retention efforts may be enhanced by better understanding of the experience of individuals considered to be underrepresented in the profession. In this qualitative study, 8 genetic counseling students and 7 practicing genetic counselors who were ethnic minority and/or male participated in semi-structured telephone interviews regarding how they were introduced to the field, perceived career supports and barriers, their experiences within training programs and the field, and suggestions for increasing diversity. Introduction to the field tended to be late and accidental. There were several career supports (e.g., field combines science and helping others) and barriers (e.g., lack of information about the field). Participant experiences, although primarily positive, included instances of passive, unintentional discrimination; and there were internal and external pressures to be diversity experts and positive representatives of their group. Participants reported positively impacting colleagues’ cultural competency and offering a different presence within clinical settings. Suggestions for increasing diversity and research recommendations are given.     

Remembering what one intended to forget: the lack of directed forgetting effects in implicit memory

The results of previous studies on directed forgetting effects in implicit memory have led to the conclusion that the underlying mechanism for such effects is an inhibition of retrieval or an encoding difficulty. Differences in procedure and stimuli may contribute to these different conclusions. In 2 studies we standardized the procedure while varying the stimuli. As in previous research, directed forgetting results were obtained for direct memory tasks. However, the magnitude of the directed forgetting effect varied with the stimuli. In Experiments 1 and 2, medium- and low-frequency to-be-remembered (R) and to-be-forgotten (F) words appeared to be equally accessible using the indirect task. In Experiment 3, we devised a procedure in which a single stem could lead to an R-word or F-word, but space was provided for only one word. In that way, we could examine the relative accessibility of R- and F-words. Results are discussed in light of Mandler's (1980) conceptualization of the contributions of identification and familiarity to memory retrieval processes.     

The contribution of metamemory deficits to schizophrenia

A number of recent studies have demonstrated that individuals with schizophrenia display knowledge corruption; that is, they hold false information with strong conviction. This aberration in metamemory is thought to stem from poor memory accuracy in conjunction with impaired discrimination of correct and incorrect judgments in terms of confidence. Thirty-one participants with schizophrenia, along with 61 healthy control participants and 48 control participants with other psychiatric conditions, participated in a computerized source memory task. Whereas no differences in memory accuracy were observed between the group with schizophrenia and the group with other psychiatric diagnoses, knowledge corruption was specifically impaired in those with schizophrenia. Schizophrenia participants showed a significantly decreased confidence gap: They were more confident in errors and less confident in correct responses relative to those in the control groups. Knowledge corruption is theorized to be a potential risk factor for the emergence of delusions.     

Community-Based Research in India: A Case Example of International and Transdisciplinary Collaboration

While there has been a trend toward greater disciplinary collaboration over the last several decades, the emergence of the HIV pandemic has required that disciplines work more closely and creatively to generate the multiple and innovative approaches necessary to meet the demands for effective prevention and treatment. This paper describes the nature of collaborative relationships among U.S. and Indian anthropologists, psychologists, demographers, epidemiologists, physicians and representatives of other fields and sectors in conducting a large scale, multi-year HIV/STD prevention project directed toward married men in urban poor communities in Mumbai (Bombay), India. The project has challenged members of the participating disciplines to develop a transdisciplinary conceptual model, to test the model with community-based formative research and to utilize the results in the development and implementation of a multi-level (community, provider and patient) intervention. The paper describes the interaction among disciplines and international sectors in the conceptualization, methodology and community-based action components of the project. In addition, it examines both the inhibiting and facilitating factors that are a part of the collaborative process. The paper concludes with implications for future transdisciplinary partnerships.