Procesamiento de la información en la esquizofrenia: Amplitud de aprehensión

Resumen

Esta investigación ha tenido como objetivo comparar la amplitud de aprehensión de dos grupos de pacientes esquizofrénicos (paranoide y no-paranoide) y la de un grupo de sujetos normales. Las variables independientes han sido la duración de la exposición y el número de items. Los resultados sugieren que los esquizofrénicos procesan la información visual menos eficientemente que los normales.     

Factores psicosociales y cáncer: una revisión crítica

Resumen

Se presenta en este artículo una introducción al campo de estudio de las relaciones entre factores psicosociales y neoplasia, enmarcándolo dentro de la medicina conductual y desde un enfoque interdisciplinar. A continuación se discute el papel que pueden desempeñar las variables psicosociales (estrés) en la vulnerabilidad del ser humano a la enfermedad en general a través de su acción sobre el sistema inmune. En el apartado III se realiza una revisión crítica en la investigación en la que se ha intentado delimitar la influencia de factores psicosociales en la aparición y pronóstico del cáncer, en animales (cáncer experimental) y en el ser humano. Se discute por último el papel de los mediadores biológicos propuestos como más importantes hasta el momento en la literatura del área (sistemas neuroendocrino e inmune). De esta revisión se desprende que los resultados de la investigación, aunque su- gerentes no son definitivos, ni tampoco están claros los mecanismos biológicos a través de los cuales se puede producir la influencia. Después de analizar algunas de las deficiencias metodológicas más importantes de los trabajos realizados, creemos que en enfoque más adecuado para poner a prueba la hipótesis de que los factores psicosociales afectan al desarrollo del cáncer debería ser longitudinal, utilizando grandes muestras y estudiando variables psicosociales y biomédicas conjuntamente.     

Study time effects in recognition memory

We empirically tested the assumption that study time increases recognition accuracy because the storage of information is better when study time is longer as Shiffrin and colleagues have reported, an assumption common to parallel models of recognition. In the present study with 123 subjects, we examined the effect of item strength on four measures: hit rate, false alarm rate, d', and beta, for a single-word recognition task with longer study times than those usually used in the literature. Analysis indicated significant increase for hit rate and d' and a decrease in false alarm rate, as one goes from weak to stronger study conditions, and a change in ln(beta) when study time is greater than 1 sec. These results suggest that familiarization is one, but not the only, factor underlying the strength-mirror effect.     

Stimulus Control with Computer Assisted Learning

Computer Assisted Learning (CAL) has been shown to be an efficient learning-teaching procedure. Although there is an extensive educational software tradition using CAL approaches, few of them have demonstrated a better student performance than standard drill and practice methods. The purpose of this study was (a) to evaluate the effectiveness of the Let's Play With... software program, and (b) to evaluate the effectiveness of a prompt (i.e. a blinking object) used in the program. The educational software Let's Play With... was designed to teach basic concepts involving shapes and body positions to preschool students. The software structure follows a behavioral design and uses a stimulus control procedure. The study was carried out with 64 preschool students in the Cadiz (Spain) School District. Statistically significant differences were found between the experimental group and a control group.     

Some personality correlates of using eBay

The use of eBay by 102 American undergraduate students was not associated with competitiveness, locus of control scores, or money attitude scores.     

Motor limitation in dual-task processing under ballistic movement conditions

The standard bottleneck model of the psychological refractory period (PRP) assumes that the selection of the second response is postponed until the first response has been selected. Accordingly, dual-task interference is attributed to a single central-processing bottleneck involving decision and response selection, but not the execution of the response itself. In order to critically examine the assumption that response execution is not part of this bottleneck, we systematically manipulated the temporal demand for executing the first response in a classical PRP paradigm. Contrary to the assumption of the standard bottleneck model, this manipulation affected the reaction time for Task 2. Specifically, reaction time for Task 2 increased with execution time for Task 1. This carryover effect from Task 1 to Task 2 provides evidence for the notion that response execution can be part of the processing bottleneck.