Modeling the Dynamics of Risky Choice

Individuals make decisions under uncertainty every day. Decisions are based on incomplete information concerning the potential outcome or the predicted likelihood with which events occur. In addition, individuals' choices often deviate from the rational or mathematically objective solution. Accordingly, the dynamics of human decision making are difficult to capture using conventional, linear mathematical models. Here, we present data from a 2-choice task with variable risk between sure loss and risky loss to illustrate how a simple nonlinear dynamical system can be employed to capture the dynamics of human decision making under uncertainty (i.e., multistability, bifurcations). We test the feasibility of this model quantitatively and demonstrate how the model can account for up to 86% of the observed choice behavior. The implications of using dynamical models for explaining the nonlinear complexities of human decision making are discussed as well as the degree to which the theory of nonlinear dynamical systems might offer an alternative framework for understanding human decision making processes.     

Motivation for Physical Activity among Hawaiian,Japanese, and Filipino University Students in Hawaii

The purpose is to identify the motivations and barriers to physical activity (PA) among the three largest ethnic groups in Hawaii (Hawaiians/part-Hawaiians, Japanese, and Filipinos). University of Hawai'i students (N = 32, aged 18+) self-identified as one of those ethnicities participated in focus groups. There are more common themes than ethnic-specific variations in factors influencing PA. PA is understood as exercise among all groups; leisure time PA like running and surfing are common activities. Results were more similar among Hawaiian and Japanese than with Filipino participants. The findings offer an opportunity for improving cross-cultural and culture-specific PA interventions for those ethnicities.     

Human food preferences and cultural identity: The case of Aragón (Spain)

This research aims to analyze the relationship between sociocultural values and human food preferences. The latter, as shown in this paper, are greatly influenced by cultural identity. This work stems from a theoretical context that originated in Europe and the United States towards the mid‐twentieth century, within the field of the anthropology of food. A qualitative and quantitative analysis has been performed in the Comunidad Autónoma de Aragón (Spain). Research methods include focus groups, in‐depth interviews, participant observation, and a questionnaire that was handed out to a representative sample of the Aragonese population (816 people over 21 years of age; confidence level of 95.5% and error margin of ±3.5). Regarding the research outcome, a highly significant qualitative and quantitative connection has been found between food selection and cultural identity. In other words, people prefer to consume foods that are symbolically associated with their own culture, in order to reinforce their sense of belonging. Although this study has been carried out in Aragón, it is our belief that the results can be generalized to other areas. The originality and interest of our findings are notable considering that, to date, few works have analyzed the sociocultural factors motivating food behavior. Moreover, these results could be used by public and private organizations to meet objectives such as health promotion and product marketing.     

Psychometric Properties and Clinical Cut-Off Scores of the Spanish Version of the Social Anxiety Scale for Adolescents

Psychotic (P) and Non-Psychotic (N-P) retardates were compared on 13 Rorschach “indicators” of psychosis using a matched pairs technique. Two of the 13 signs were found to significantly differentiate between groups with the P group demonstrating a lower F% and higher C' responding than the N-P group.     

Niveles experimentales de conflicto social e influencia minoritaria: Límites en la definición de influencia indirecta

Resumen

El propósito de la presente investigación es desarrollar una jerarquía experimental que estudie las características más importantes del conflicto social en los procesos de influencia minoritaria. También se hace un análisis de los límites de la influencia latente minoritaria. Se defiende así la idea de que la influencia indirecta de las minorías reposa sobre una relación de naturaleza binaria no transitiva entre las posiciones minoritarias y las opiniones y actitudes objeto de influencia. Para ello se elaboró una serie de experimentos que combinan las siguientes variables, pertenencia categorial y presentatividad de la fuente minoritaria, en un diseño factorial 3 x 2. Los sujetos, 107 escolares (110 mujeres y 87 varones) fueron distribuidos en seis condiciones experimentales resultantes de la combinación de dos clases de variables: fuente de influencia perteneciente a un intragrupo, a un extragrupo, o a una minoría sin categorización social; fuente minoritaria representativa o no representativa. Los resultados subrayan la importancia del conflicto social en la producción de la influencia minoritaria y parecen confirmar la hipótesis de los límites en la influencia indirecta minoritaria.     

Potenciales evocados en respuesta a expresiones faciales de emociones

Resumen

En el presente experimento se analizaron los potenciales evocados (PEs) de 32 sujetos en respuesta a diapositivas en color de cuatro expresiones faciales presentadas 32 veces cada una: alegría, tristeza, ira y neutra. La estructura de los PEs, registrados en Fz, Cz y Pz, se analizó vía análisis de componentes principales (ACP). Los ANOVAs indicaron que las amplitudes de N150 y P200 mostraron un doble emparejamiento alegría-ira y tristeza-neutra. Estos componentes han sido relacionados en anteriores estudios con el análisis físico de los estímulos. La visibilidad o no de los dientes en las expresiones puede explicar tales emparejamientos. Los resultados de componentes posteriores (N250 y P300) mostraron diferencias significativas entre las expresiones neutra y de alegría. Estos datos pueden ser interpretados tanto en términos de procesamiento afectivo como cognitivo. En todos los casos, Fz y Cz fueron las localizaciones donde las amplitudes de los componentes estudiados fueron mayores.     

La tarea de seguimiento en el estudio de la atención selectiva

Resumen

La utilización de la tarea de seguimiento en el estudio de la atención selectiva, ha dado lugar a un gran número de resultados confusos y contradictorios que han influido en el mantenimiento de la controversia sobre el problema de la selectividad.

El objetivo del presente artículo fue analizar algunos factores responsables de esta discrepancia experimental: 1. Problemas metodológicos asociados con los estudios de seguimiento.

2. Variables relacionadas con la tarea de seguimiento cuya influencia no ha sido tomada en cuenta en la literatura.

3. Concepciones teóricas extremas sobre la atención selectiva.

El análisis realizado sugiere un replanteamiento de los problemas de selectividad y capacidad, donde se cuestione la dicotomia selección anterior/posterior y en su lugar se asuman concepciones más flexibles del proceso atencional.     

The natural history of information processors

By spanning the traditional scientific theories in the search for an epistemological home for information it is found that Physics (together with some inputs from Automata Theory) provides the criteria to identify the universals that characterize information processors. It is well known, however, that Physics and Mathematics alone are insufficient to answer some fundamental questions that arise in further speculations on the subject of information. It seems that Biology, in the realm of Evolution Theory and in terms of Natural Selection, is at present the only place able to offer the objective context required to properly characterize information as an object of scientific inquiry.

In this communication we intend to show, by establishing a working equivalence between the epistemological questions that should characterize a theory of information and those questions that characterize the science of Biology, how a science of information can be more objectively characterized. It is only by referring to selective pressures that we can solve the otherwise unanswerable philosophical question of whether it is possible to know if two players of a game are, in fact, playing the same game (the semantic question). It is also shown that it is possible, by using conventional criteria, to establish a phylogenesis of information processors from where we conclude that every information processor now existing in the universe (even computers and robots) has an ancestor that has once been a living being.

It is here suggested, however, that Biology is only a provisory epistemological ground for laying the foundations of an information science. A more inclusive theory should be founded on a generalization of the Theory of Evolution where mutation and natural selection should be described, not in terms of the characteristic media and mechanisms of biological systems, but of the identified universals of information processors.     

Only your eyes tell me what you like: Exploring the liking effect induced by other's gaze

Our preferences are sensitive to social influences. For instance, we like more the objects that are looked-at by others than non-looked-at objects. Here, we explored this liking effect, using a modified paradigm of attention cueing by gaze. First, we investigated if the liking effect induced by gaze relied on motoric representations of the target object by testing if the liking effect could be observed for non-manipulable (alphanumeric characters) as well as for manipulable items (common tools). We found a significant liking effect for the alphanumeric items. Second, we tested if another type of powerful social cue could also induce a liking effect. We used an equivalent paradigm but with pointing hands instead of gaze cues. Pointing hands elicited a robust attention-orienting effect, but they did not induce any significant liking effect. This study extends previous findings and reinforces the view of eye gaze as a special cue in human interactions.