A specific role for efferent information in self-recognition

We investigated the specific contribution of efferent information in a self-recognition task. Subjects experienced a passive extension of the right index finger, either as an effect of moving their left hand via a lever ('self-generated action'), or imposed externally by the experimenter ('externally-generated action'). The visual feedback was manipulated so that subjects saw either their own right hand ('view own hand' condition) or someone else's right hand ('view other's hand' condition) during the passive extension of the index finger. Both hands were covered with identical gloves, so that discrimination on the basis of morphological differences was not possible. Participants judged whether the right hand they saw was theirs or not. Self-recognition was significantly more accurate when subjects were themselves the authors of the action, even though visual and proprioceptive information always specified the same posture, and despite the fact that subjects judged the effect and not the action per se. When the passive displacement of the participants right index finger was externally generated, and only afferent information was available, self-recognition performance dropped to near-chance levels. Differences in performance across conditions reflect the distinctive contribution of efferent information to self-recognition, and argue against a dominant role of proprioception in self-recognition.     

Schizophrenia risk and paternal age: a potential role for de novo mutations in schizophrenia vulnerability genes

How schizophrenia (SZ) is maintained at roughly 1% of the population despite diminished reproduction is one puzzle currently facing researchers. De novo mutations were first proposed over half a century ago as a source for new SZ genes. Current evidence linking advancing paternal age to SZ risk makes revisiting this hypothesis important. Advancing paternal age is the major source of new mutations in the human population. This article will examine potential mechanisms whereby parental age may impact new mutations, as well as review recent data supporting such a hypothesis.     

Contents to Volume 6

Volume Contents

Contents to Volume 6     

FACTORS ASSOCIATED WITH ACCULTURATIVE STRESS AND DEPRESSIVE SYMPTOMATOLOGY AMONG MARRIED MEXICAN IMMIGRANT WOMEN

The purpose of the present study was to describe levels of acculturative stress and individual stressors and their relationship to levels of depressive symptomatology among young Mexican immigrant women. The mean age of the respondents was 25.7 years with a mean of 9.4 years of education. Their age at migration was 18.5 years and their average length of stay in the United States was 7.5 years. Women who in the last three months experienced discrimination, sex-role conflicts, and concern about starting a family in this country had significantly higher (over 16) CES-D scores than women who did not report experiencing those situations. The overall findings suggest that this sample of Mexican women immigrants as a group are at risk for the development of psychological problems.     

Profiles of emotional intelligence and demotivation to attend school in Chilean adolescents

The aim of this study was twofold: to identify different emotional intelligence (EI) profiles and to verify possible statistically significant differences in school refusal factors that result in a demotivation to attend school. Participants were 2362 Chilean adolescents aged from 13 to 17 (M?=?15.25; SD?=?1.33), who completed the Trait Meta-Mood Scale-24 (TMMS-24) and the School Refusal Assessment Scale-Revised (SRAS-R). Cluster analysis identified four EI profiles: high scores in repair and low in attention, high scores in attention and low in clarity and repair, low EI and high EI. Students with high scores in attention and low in repair scored higher in the first three factors of the SRAS-R, whereas in the fourth factor of the SRAS-R, students with high EI had significantly higher scores. Emotional regulation seems to be one of the determinant factors to prevent the appearance of school refusal. Based on these findings, we recommend that EI training be a part of future programs to overcome school attendance demotivation issues.     

Insight into illness and adherence to psychotropic medications are separately associated with violence severity in a forensic sample

Violence towards others by a minority of psychotic individuals is a significant public health concern. The severity of this other-directed violence (ODV) in the community may be influenced by insight into illness and adherence to psychotropic medications; however, few studies have tested these associations. Sixty male psychotic inpatients, legally detained at a forensic unit in New York City, were assessed with semi-structured interviews, supplemented with information from hospital and official records, family members and the treating clinician. Results indicated that in this unique sample of detained persons with psychotic disorders; (1) increase in the severity of community violence is associated with medication non-adherence, all dimensions of poor insight into illness, and several previously reported covariates such as substance use comorbidity; (2) no relationship was found between insight and adherence in this particular sample; (3) multivariate analyses showed that select covariates, along with medication adherence, and select insight domains predicted a total of 73% of the magnitude of ODV behavior in this sample. Overall, medication non-adherence explained a large amount of how violently participants behaved toward others. Since non-adherence was independent of poor insight, it may be more worthwhile for clinicians to develop treatment strategies to target medication adherence without directly addressing an elusive target such as insight into illness. Treatment addressing medication adherence needs to concomitantly target substance use behaviors since the latter was responsible for a substantial increase in ODV.     

Paternal absence and international migration: stressors and compensators associated with the mental health of Mexican teenagers of rural origin

Mexico-U.S. migration creates situations that may cause psychological distress. The purpose of this research project was to study the impact of father's physical absence due to international migration (FPAIM) on adolescent offspring of rural immigrants from Zacatecas, Mexico. Stressors and compensators were studied from the adolescent's perspective and were analyzed using a stress-mediator-consequences theoretical framework. Qualitative (n = 24) and quantitative (n = 310) methodologies were used with a nonrandom sample of adolescents. Results show that the FPAIM is an ambivalent experience for adolescents that has positive and negative elements. Though migrants' children seem to be more vulnerable to psychosocial stress than are the offspring of nonmigrants, gender, not father's absence, appears to be the most important risk factor for psychological distress.     

Fetal neurobehavioral development: a tale of two cities

Longitudinal neurobehavioral development was examined in 237 fetuses of low-risk pregnancies from 2 distinct populations--Baltimore, Maryland, and Lima. Peru--at 20, 24, 28, 32, 36, and 38 weeks gestation. Data were based on digitized Doppler-based fetal heart rate (FHR) and fetal movement (FM). In both groups. FHR declined while variability, episodic accelerations, and FM-FHR coupling increased, with discontinuities evident between 28 and 32 weeks gestation. Fetuses in Lima had higher FHR and lower variability, accelerations, and FM-FHR coupling. Declines in trajectories were typically observed 1 month sooner in Lima, which magnified these disparities. Motor activity differences were less consistent. No sex differences in fetal neurobehaviors were detected. It is concluded that population factors can influence the developmental niche of the fetus.     

UNDERSTANDING THE SEXUALITY OF MEXICAN-BORN WOMEN AND THEIR RISK FOR HIV/AIDS

Participants in this study were 300 Mexican women of rural origin who were born and raised in villages of that country and who belong to one of three groups: married and living with their husbands in Los Angeles, California ( n = 100), married to migrant workers but living in Mexico ( n = 100), and living in Mexico with their spouses ( n = 100). Trained female professionals conducted face-to-face interviews in Spanish, in Mexico and in the United States. The purpose of this study was to identify specific sexual practices, coping strategies in sex-related situations, and fears and concerns regarding sexual intercourse. This article analyzes how these elements place Mexican ruralorigin women at risk for HIV/AIDS. It discusses the need to design intervention strategies to prevent HIV/AIDS that take into consideration the limited power of women in traditional societies and the cultural precepts that promote gender roles characterized by male dominance and female submissiveness in the sexual arena.