Empathy,sex and fluid intelligence as predictors of theory of mind

Individual differences in theory of mind (ToM) are affected by a variety of factors. We investigated the relationship between empathy, sex and fluid intelligence (FI) as predictors of ToM in a random probabilistic sample of secondary students. First, we explored whether sex, as well as high, average or low levels of empathy and FI affect ToM performance. Furthermore, we assessed the contribution of empathy, sex and FI in predicting ToM by using a path analysis. This method allows testing of causal models of directed dependencies among a set of variables. The causal dependencies of empathy, sex and fluid intelligence were confirmed and identified. In addition, the model confirmed the direct effect of empathy, sex and fluid intelligence on ToM; and the indirect effect of sex mediated by empathy. Thus, individual differences in ToM levels are partially attributable to sex, empathy and fluid intelligence variability, raising important considerations for clinical research as well as ToM’s theoretical models of domain specificity.     

El lenguaje de signos

RESUMEN

En los últimos años se ha producido un importante y significativo crecimiento de las investigaciones y publicaciones sobre el lenguaje de signos. Los primeros escritos sobre este tema se orientaron a establecer su “status” como lenguaje y su papel en la educación de los niños sordos. Investigaciones posteriores sobre el American Sing Languaje (ASL) y otros lenguajes de signos se orientaron a una descripción lingüística adecuada que hiciera posible la construcción de una gramática. La revisión realizada en este trabajo sobre el lenguaje de signos y sus aplicaciones educativas se ha dividido en cuatro apartados principales. El primero se centra en la evolución histórica, la estructura interna y los procesos gramaticales del lenguaje de los signos. El segundo plantea los principales estudios realizados sobre la adquisición del lenguaje manual. El tercero trata de revisar y valorar las investigaciones sobre la influencia de la adquisición temprana del lenguaje de signos en el desarrollo cognitivo, social y lingüístico. Y en la última parte se plantea la utilidad educativa del lenguaje de signos tanto para los sordos profundos como para otros niños también con deficiencias en la comunicación.     

TMS suppression of right pars triangularis, but not pars opercularis, improves naming in aphasia

This study sought to discover if an optimum 1 cm² area in the non-damaged right hemisphere (RH) was present, which could temporarily improve naming in chronic, nonfluent aphasia patients when suppressed with repetitive transcranial magnetic stimulation (rTMS). Ten minutes of slow, 1 Hz rTMS was applied to suppress different RH ROIs in eight aphasia cases. Picture naming and response time (RT) were examined before, and immediately after rTMS. In aphasia patients, suppression of right pars triangularis (PTr) led to significant increase in pictures named, and significant decrease in RT. Suppression of right pars opercularis (POp), however, led to significant increase in RT, but no change in number of pictures named. Eight normals named all pictures correctly; similar to aphasia patients, RT significantly decreased following rTMS to suppress right PTr, versus right POp. Differential effects following suppression of right PTr versus right POp suggest different functional roles for these regions.     

Analysis of the multidimensionality of hallucination-like experiences in clinical and nonclinical Spanish samples and their relation to clinical symptoms: implications for the model of continuity

Numerous studies have found that hallucinatory experiences occur in the general population. But to date, few studies have been conducted to compare clinical and nonclinical groups across a broad array of clinical symptoms that may co-occur with hallucinations. Likewise, hallucination-like experiences are measured as a multidimensional construct, with clinical and subclinical components related to vivid daydreams, intrusive thoughts, perceptual disturbance, and clinical hallucinatory experiences. Nevertheless, these individual subcomponents have not been examined across a broad spectrum of clinically disordered and nonclinical groups. The goal of the present study was to analyze the differences and similarities in the distribution of responses to hallucination-like experience in clinical and nonclinical populations and to determine the relation of these hallucination-like experiences with various clinical symptoms. These groups included patients with schizophrenia, non-psychotic clinically disordered patients, and a group of individuals with no psychiatric diagnoses. The results revealed that hallucination-like experiences are related to various clinical symptoms across diverse groups of individuals. Regression analysis found that the Psychoticism dimension of the Symptom Check List (SCL-90-R) was the most important predictor of hallucination-like experiences. Additionally, increased auditory and visual hallucination was the only subcomponent that differentiated schizophrenic patients from other groups. This distribution of responses in the dimensions of hallucination-like experiences suggests that not all the dimensions are characteristic of people hearing voices. Vivid daydreams, intrusive thoughts, and auditory distortions and visual perceptual distortions may represent a state of general vulnerability that does not denote a specific risk for clinical hallucinations. Overall, these results support the notion that hallucination-like experiences are closer to a quasi-continuum approach and that total scores on these scales explain a state of vulnerability to general perceptual disturbance.     

Essentialism and the expression of social stereotypes: a comparative study of Spain, Brasil and England

Over the past few years, one of the most productive directions in the study of the activation and application of stereotypes has been provided by the essentialist concept of categorization. The research presented here studied the impact of two dimensions of essentialist beliefs--naturalism and entitativity-by using data collected from Brazil, Spain and England. The aim was to test whether there was a greater degree of essentialization among the naturalizable categories (sex, age and race) than among the entitative categories (economic condition, religion, political orientation, nationality and social condition). The results not only showed that participants hold more essentialist beliefs with regard to naturalistic categories but also showed the differences in the degree of essentialization across the three cultures. A discussion is conducted on the implications of the present findings, and on the heuristic value of the theoretical model (of the bidimensional nature of essentialism) adopted by this research.     

The role of motion direction selective extrastriate regions in reading: a transcranial magnetic stimulation study

Why reading ability is correlated with motion processing ability is perplexing. Activity in motion direction processing regions (Area V5/MT+) was perturbed by means of repetitive transcranial magnetic stimulation (rTMS) to examine its effect on reading. A functional probe (significant shortening of the motion aftereffect) was used to identify Area V5/MT+. Right-handed participants (8 m, 8 f) received three 7.5 min blocks of rTMS, after which two phonological and one orthographic reading tasks were administered. Application of rTMS to Area V5/MT+ (as compared to a non-rTMS baseline) significantly decreased performance only during non-word naming. The pattern of naming errors and the absence of deficits on the second phonological task were not consistent with a role for Area V5/MT+ in phonological decoding. Instead, its role in reading may be limited to image stabilization and/or letter localization.     

ORGANISMIC PROCESSES FOR NEO-PIAGETIAN THEORIES: A DIALECTICAL CAUSAL ACCOUNT OF COGNITIVE DEVELOPMENT

The paper criticizes some epistemological presuppositions of Piaget's and of neo-Piagetian's work, in particular, the psycho-Logical principle. This principle is contrasted with a more valid psycho-dialectical one. It is suggested that a dialectical-constructivist (i.e., causal-dynamic) perspective offers a causal theoretical framework for cognitive development that is superior to that of Piaget and many neo-Piagetians. I outline criteria for evaluating causal developmental theories, and point out deficiencies in Piaget's and neo-Piagetian's stage theories vis-à-vis the criteria. An organismic theory of constructive operators - a dialectical/causal theory - is introduced as a remedy for these deficiencies. I focus on a modular model of mental attention that is constituted by four dynamically interacting functional systems. These systems together explain the ‘beam’ of mental attention and its phenomenological/behavioural effects. I claim that the stages of cognitive development are caused by growth of mental attention. The validity of this model is supported by data on a motor performance task (Rho task). The Rho data show: (a) the existence of stage-wise plateaus in children's performance at ages congruent with the redefined Piagetian stages; (b) the psychological structures which, driven by mental attention (M-capacity), are responsible for performance on the task, appear to be located in the left hemisphere of the brain. These findings, predicted by the dialectical theory of mental attention, highlight its causal-predictive power.     

Failure of conservation training of disadvantaged black teenagers: a neo-Piagetian interpretation.

From a structural point of view, conservation tasks resemble Witkin's field-dependence situations. According to our neo-Piagetian theory, therefore, the failure of certain disadvantaged black teenagers to profit from conservation training may be related to their field dependence.