Transitional and steady-state choice behavior under an adjusting-delay schedule

Twelve rats made repeated choices on an adjusting-delay schedule between a smaller reinforcer (A) that was delivered immediately after a response and a larger reinforcer (B) that was delivered after a delay which increased or decreased by 20% depending on the subject's choices in successive blocks of trials. In two phases of the experiment (100 sessions and 40 sessions), reinforcer sizes were selected which enabled theoretical parameters expressing the rate of delay discounting and sensitivity to reinforcer size to be estimated from the ratio of the indifference delays obtained in the two phases. Indifference delays, calculated from adjusting delays in the last 10 sessions of each phase, were shorter when the sizes of A and B were 14 and 25 μl of a 0.6 M sucrose solution than when they were 25 and 100 μl of the same solution. The ratio of the indifference delays was significantly smaller than that predicted on the basis of an assumed linear relation between reinforcer size and instantaneous reinforcer value, consistent with a previous proposal that this relation may be hyperbolic in form. Estimates of the rate of delay discounting based on the ratio of the two indifference delays (mean, 0.08 s(-1)) were similar to values obtained previously using different intertemporal choice protocols. Estimates of the size-sensitivity parameter (mean 113 μl) were similar to estimates recently derived from performance on progressive-ratio schedules. In both phases of the experiment, adjusting delays in successive blocks of trials were analyzed using the Fourier transform. The power spectrum obtained from individual rats had a dominant frequency that corresponded to a period of oscillation of the adjusting delay between 30 and 100 trial blocks (mean, 78). Power in the dominant frequency band was highest in the early sessions of the first phase and declined with extended training. It is suggested that this experimental protocol may have utility in neurobehavioral studies of intertemporal choice.     

Spanish adaptation of the Stress Manifestations Scale of the Student Stress Inventory (SSI-SM)

The aim of the present study was to translate into Spanish and to describe the psychometric properties of the Stress Manifestations Scale of the Student Stress Inventory (SSI-SM), developed by Fimian, Fastenau, Tashner and Cross to identify the main manifestations of stress in adolescents. The scale was applied to a sample of 1,002 pupils from years one and two of Secondary Education. The paper reports the factor structure, an item analysis, the internal consistency, differences by sex and academic year, external evidence of validity, and norms for scoring the scale. The results reveal a factor structure based on three first-order factors (emotional manifestations, physiological manifestations and behavioural manifestations) and one second-order factor (indicative of stress manifestations). In terms of external validity, there was a positive association with measures of perceived stress, aggressiveness, internalized/externalized symptoms, and a negative association with life satisfaction. The results show that the scale is an adequate tool for evaluating stress manifestations in adolescents.     

Systematic Review of Behavioral Interventions Using Digital Technology to Reduce Problem Behavior in the Classroom

Journal of Behavioral Education - Problem behavior in the classroom leads to challenges for teachers who often feel ill equipped to address such behavior. Behavior analytic interventions have been...     

Dependency in consumer media relations: an application to the case of teleshopping

• This paper analyses the teleshopping issue in terms of the Media Dependency Theory. The objective is to verify whether dependency relations between television shoppers and the television medium and television shopping are key variables to explain watching and buying behaviour. A model is proposed that integrates the dependency‐viewing‐purchase relation, tested on a sample of Spanish television shoppers. The results of the study confirm the direct relationship between the antecedents of dependency, dependency and future intentions of behaviour.

Copyright © 2006 John Wiley & Sons, Ltd.     

Barriers and Supports to Substance Abuse Service Use Among Homeless Adults

Although there is a great need for substance abuse services among the homeless, many homeless individuals do not use those services. This study examined barriers and supports related to service use. Participants recognized a need for treatment and significant barriers to accessing care.     

Introspección e informes verbales en procesamiento humano de información

RESUMEN

El objetivo de este trabajo es realizar una revisión y reflexión en la investigación y teorías que se basan en informes verbales. Reflexionar sobre el valor introspectivo de los informes verbales con respecto a las funciones del procesamiento. Todo esto desde la actual psicología cognitiva. Para ello se revisan todas aquellas investigaciones que se plantean el papel de la conciencia en el proceso y como producto del pensamiento humano, a través de una comunicación externa.     

Incidencia de las representaciones gráficas en la solución de problemas por analogía. Réplica a Gick y Holyoak

RESUMEN

Sierra y Froufe cuestionan un trabajo anterior sobre la utilidad de representaciones gráficas en la solución de problemas mediante razonamiento analógico y presentan un análisis detallado de algunos procesos fundamentales en esta clase de pensamiento. Empiezan por describir los experimentos llevados a cabo por Gick y Holyoak (1983) y discutir algunas de sus conclusiones, ofreciendo interpretaciones alternativas. A continuación exponen cómo se explica la inducción de un esquema a partir del establecimiento de una analogía y, en segundo lugar, comparan los diagramas utilizados por Gick y Holyoak con los obtenidos en un trabajo de uno de los autores (Sierra, 1985) tomando como marco de referencia la exposición acerca de la inducción de esquemas. Finalmente se concluye que, en parte, los sujetos del experimento anterior no recurrían al diagrama porque, al ser incompleto, no les permitía solucionar el problema, sugiriendo que un sistema representacional basado enteramente en las proposiciones resulta insuficiente y que la imagen mental del dibujo juega una función cognitiva en la solución.     

Dimensions of “uniquely” and “non‐uniquely” human emotions

Emotion scientists often distinguish those emotions that are encountered universally, even among animals ( “primary emotions”), from those experienced by human beings ( “secondary emotions”). No attempt, however, has ever been made to capture the lay conception about this distinction and to find the criteria on which the distinction is based. The first study presented in this paper was conducted in three countries involving four languages, so as to allow for cross‐cultural comparisons. Results showed a remarkable convergence. People from all samples not only differentiated between “uniquely human” and “non‐uniquely human” emotions on a continuum, but they did so on the same basis as the one used by emotion scientists to distinguish between “primary” and “secondary” emotions. Study 2 focused on the implicit use of such a distinction. When confronted with a human (animal) context, participants reacted faster to secondary (vs primary) emotions. The implications of the human uniqueness of some emotions within the social and interpersonal contexts are discussed.