With the past behind and the future ahead: Back-to-front representation of past and future sentences

Several studies support the psychological reality of a mental timeline that runs from the left to the right and may strongly affect our thinking about time. Ulrich and Maienborn (Cognition 117:126–138, 2010) examined the linguistic relevance of this timeline during the processing of past- and future-related sentences. Their results indicate that the timeline is not activated automatically during sentence comprehension. While no explicit reference of temporal expressions to the left–right axis has been attested (e.g., *the meeting was moved to the left), natural languages refer to the back–front axis in order to encode temporal information (e.g., the meeting was moved forward). Therefore, the present study examines whether a back–frontal timeline becomes automatically activated during the processing of past- and future-related sentences. The results demonstrate a clear effect on reaction time that emerges from a time–space association along the frontal timeline (Experiment 1). However, this activation seems to be nonautomatic (Experiment 2), rendering it unlikely that this frontal timeline is involved in comprehension of the temporal content of sentences.     

Emotional valence and physical space: limits of interaction

According to the body-specificity hypothesis, people associate positive things with the side of space that corresponds to their dominant hand and negative things with the side corresponding to their nondominant hand. Our aim was to find out whether this association holds also true for a response time study using linguistic stimuli, and whether such an association is activated automatically. Four experiments explored this association using positive and negative words. In Exp. 1, right-handers made a lexical judgment by pressing a left or right key. Attention was not explicitly drawn to the valence of the stimuli. No valence-by-side interaction emerged. In Exp. 2 and 3, right-handers and left-handers made a valence judgment by pressing a left or a right key. A valence-by-side interaction emerged: For positive words, responses were faster when participants responded with their dominant hand, whereas for negative words, responses were faster for the nondominant hand. Exp. 4 required a valence judgment without stating an explicit mapping of valence and side. No valence-by-side interaction emerged. The experiments provide evidence for an association between response side and valence, which, however, does not seem to be activated automatically but rather requires a task with an explicit response mapping to occur.     

Opposite actions of dopamine on aversive and appetitive memories in the crab

The understanding of how the reinforcement is represented in the central nervous system during memory formation is a current issue in neurobiology. Several studies in insects provide evidence of the instructive role of biogenic amines during the learning and memory process. In insects it was widely accepted that dopamine (DA) mediates aversive reinforcements. However, the idea of DA being exclusively involved in aversive memory has been challenged in recent studies. Here, we study the involvement of DA during aversive and appetitive memories in the crab Chasmagnathus. We found that DA-receptor antagonists impair aversive memory consolidation, in agreement with previous reports in insects, while administration of DA facilitates memory formation after a weak training protocol. In contrast, DA treatment during appetitive training was found to impair formation of long-term appetitive memory. In addition, as a first step in elucidating the neuroanatomical correlates of DA action on memory, we mapped dopaminergic neurons in the central nervous system of the crab. Results of the current study, together with those obtained in a previous work about the role of octopamine (OA), suggest that both amines (DA and OA) play a dual action in memory processes. On the one hand, DA and OA mediate the aversive and the appetitive signals, respectively, throughout training, while on the other hand, they interfere with the formation of memory of the opposite sign (DA in appetitive and OA in aversive). Our results support a new understanding about the way appetitive and aversive stimuli are processed during memory formation to ensure adaptive behavior.     

Psicobiología del síndrome de Down

Resumen

En este artículo revisamos los conocimientos que existen en la actualidad sobre el síndrome de Down, atendiendo a todos aquellos aspectos que, por su relevancia, facilitan una mejor comprensión de esta cromosomopatía. Después de una breve reseña histórica, y tras definir lo que se entiende por síndrome de Down, pasamos a ocuparnos de la alteración genética que lo determina, así como de los factores que parecen estar relacionados con su origen. A continuación estudiamos las alteraciones específicas que acompañan a este síndrome, considerando principalmente los aspectos morfológicos externos, el problema de la hipotonía muscular y otros trastornos biomédicos, el retraso mental y las diversas anomalías neuroanatómicas y neurofisiológicas que presentan los sujetos afectados. Por último, indicamos las nuevas perspectivas que se abren en el estudio de esta alteración genética.     

Estudio de las diferencias individuales en gastos atencionales,a partir de una tarea de papel y lápiz

Resumen

En este trabajo, que conjuga la tradición psicométrica con la perspectiva de procesamiento de información, se estudió si las diferencias en rendimiento observadas en los tests están asociados a diferencias individuales en gasto atencional. Fueron seleccionados 4 grupos extremos de sujetos en función de dos factores de inteligencia (verbal y espacial), los cuales realizaron una tarea de verificación de frases (tarea primaria) aisladamente o en conjunción con una de emparejamiento perceptivo (tarea secundaria). Se utilizaron como variables dependientes el número de aciertos de la tarea primaria, en ambas condiciones, y en la tarea secundaria, con tiempo limitado; y el número de errores en ambas tareas, sin límite de tiempo. Los sujetos altos verbales tuvieron más aciertos que los bajos verbales al ejecutar la tarea primaria en solitario, e iguales diferencias se encontraron entre altos y bajos espaciales; no se observaron diferencias en el número de errores. Al realizar ambas tareas concurrentemente, los altos verbales tienen mayor número de aciertos y cometen menos errores, en la tarea primaria, que los bajos verbales; los altos y bajos espaciales se diferencian únicamente en el número de aciertos. Estos resultados son discutidos y comparados con estudios diferenciales recientes.     

Peasants' Social Representation of Politicians in a Clientelist Rural Context

In Latin America, political clientelism is one of the main obstacles to the process of sustaining truly democratic practices. Thus, this article proposes to study peasants from the Province of Formosa, Argentina's social representation of politicians, in hopes of shedding light on the relationship between said representations and clientelist practices, with the objective of making a contribution to the development of alternative means towards democratization in the area. The results of this case study show that, at the center of the peasants' social representation of politicians, there lies a tendency to place their expectations for receiving assistance within a context of a personalized and hierarchical relationship framework. Nevertheless, the majority of these farmers consider the assistance received to be insufficient and inadequate, stating that politicians actually look to satisfy their own interests and not those of the general public. In conclusion, the peasants' social representation of politicians favors clientelist practices, even though these small farmers do not identify, via their culture or their expectations, with these practices. Copyright © 2012 John Wiley & Sons, Ltd.     

Volunteering and well‐being: is pleasure‐based rather than pressure‐based prosocial motivation that which is related to positive effects?

This article seeks to establish whether prosocial motivation in a sample of 251 volunteers is based on pleasure and not on pressure, which is related to the states of general well‐being (hedonic and eudaimonic measures) and the various states of well‐being specifically associated with volunteerism (volunteer satisfaction, volunteer engagement, and study enjoyment), all of this irrespective of the age of the volunteers. An analysis of partial correlations and linear regression leads to the conclusion that volunteerism undertaken as a non‐obligatory, planned helping activity, sustained over time and within an organizational context, is not always associated with positive effects in terms of well‐being. It seems that these positive effects are related to pleasure‐based prosocial motivation.