Time-dependent modulation of inhibitory avoidance memory by spermidine in rats

The polyamines, spermine, spermidine, and putrescine, are a group of aliphatic amines that may act as physiological modulators of N-methyl-D-aspartate (NMDA) receptors. Although the modulatory role of polyamines in NMDA receptor function has long been known, the effects of polyamines on learning and memory only recently began to be unraveled. In the present study, we investigated the effect of bilateral infusions of spermidine (0.02-2 nmol), a polyamine agonist, into the CA1 region of the rat dorsal hippocampus on inhibitory avoidance learning 30 min pre-training, immediately post-training, 6 h post-training, or 10 min pre-test. Bilateral microinjections of 0.2 nmol spermidine prolonged step-down latencies compared to the respective control group when administered 30 min pre-training or immediately post-training. These results provide evidence that the modulatory effects of spermidine on the acquisition and/or early consolidation of memory of inhibitory avoidance tasks in the hippocampus occur within a limited time window.     

Effects of semantic cues on mathematical modeling: Evidence from word-problem solving and equation construction tasks

Mathematical solutions to textbook word problems are correlated with semantic relations between the objects described in the problem texts. In particular, division problems usually involve functionally related objects (e.g., tulips-vases) and rarely involve categorically related objects (e.g., tulips-daisies). We examined whether middle school, high school, and college students use object relations when they solve division word problems (WP) or perform the less familiar task of representing verbal statements with algebraic equations (EQ). Both tasks involved multiplicative comparison statements with either categorically or functionally related objects (e.g., "four times as many cupcakes [commuters] as brownies [automobiles]"). Object relations affected the frequency of correct solutions in the WP task but not in the EQ task. In the latter task, object relations did affect the structure of nonalgebraic equation errors. We argue that students use object relations as "semantic cues" when they engage in the sense-making activity of mathematical modeling.     

Determinants of employee punctuality

Although researchers have studied employee lateness empirically (e.g., S. Adler & J. Golan, 1981; C. W. Clegg, 1983), few have attempted to describe the punctual employee. In the present study, results of a discriminant analysis on employees in Israel indicated that a personality characteristic, time urgency, a subcomponent of Type A behavioral pattern, distinguished between punctual and late employees. Organizational commitment and age of employee's youngest child also distinguished between the groups.     

Effects of sentential context on the processing of unambiguous words by the two cerebral hemispheres

The effect of sentence context on the processing of different aspects of meaning of unambiguous nouns by the two cerebral hemispheres was examined. Participants performed a lexical decision task on target words following two primes, an unambiguous noun preceded by an incomplete sentence. Priming sentences were consistent with either the dominant or the subordinate aspect of meaning of their final unambiguous word. Short and long SOAs were used. A principal finding of this study was that, when compared to unrelated aspects of meaning, for both the short and the long SOAs, the dominant and subordinate aspects of meaning of the unambiguous words were activated regardless of context in both hemispheres. However, the activation of the subordinate aspect of meaning of unambiguous words appears to be more sensitive to sentential context, especially when the unambiguous word is being processed by the left hemisphere.     

The influence of social identity on value perceptions and intention

Despite much research on consumers' brand identification, researchers remain divided regarding the conceptualization of the dimensions underlying social identity and how these dimensions impact marketing outcome variables. Further, previous studies have failed to examine the underlying psychological process driving this effect. The current research is the first to assess the importance of affective social identity as the mediator through which cognitive social identity impacts consumers' purchase intentions by ways of emotional and social value. Results show that affective social identity mediates the relationship between cognitive social identity and emotional value, where affect is the main driver in the formation of purchase intention. This study highlights the need to model cognitive and affective social identity separately and provides insight into how consumers' social identification influences their perceptions of identity‐linked products. Copyright © 2016 John Wiley & Sons, Ltd.     

Attachment dimensions in adolescence: an adaptation of the Inventory of Parent and Peer Attachment (IPPA) into Basque / Dimensiones del apego en la adolescencia: adaptación al euskera del Inventario de Apego de Progenitores y Pares (IPPA)

Abstract

The aim of this study was to develop a short Basque version of the Inventory of Parent and Peer Attachment (IPPA), as well as to test its factor structure and analyse other psychometric properties. Two studies were carried out. In the first study a confirmatory factor analysis conducted on a sample of 1037 adolescents did not show an optimal model fit of the three-dimensional structure of the original instrument. A subsequent analysis of principal components revealed a one-dimensional structure. The analysis of items led to the elaboration of short forms. In the second study, carried out on another sample of 2129 adolescents, the one-dimensional structure was confirmed, further external validity evidence was provided, and good reliability indices were obtained. A single dimension is concluded, attachment security, as well as the validity and reliability of the short forms of the IPPA in Basque scales.     

Extending the Negative Consequences of Media Internalization and Self-Objectification to Dissociation and Self-Harm

Self-objectification is often understood as a consequence of internalizing unrealistic media ideals. The consequences of self-objectification have been well studied and include depression and self-harm. We argue that body surveillance, a component of self-objectification that involves taking an observer’s perspective on oneself, is conceptually related to dissociation, a variable related to depression and self-harm. We hypothesized that the normative experience of self-objectification may increase the risk that young women dissociate in other contexts, providing an additional indirect path between self-objectification, depression, and self-harm. Snowball sampling begun with postings on Facebook was used to recruit 160 women, believed to be primarily from the U.S., to complete an online survey about the effects of media on young women. All participants ranged in age from 18–35 (M?=?23.12, Median?=?22, Mode?=?21). Using this sample, we tested a path model in which internalization of media ideals led to body surveillance and body shame, body surveillance led to dissociation and body shame, body shame and dissociation led to depression, and dissociation and depression led to self-harm. This model, in which we controlled for the effects of age, had good fit to the data. Our findings suggest that self-harm and dissociation, both outcomes associated with the literature on trauma, are related to self-objectification. These relationships are discussed in terms of conceptualizing objectification and self-objectification as a form of insidious trauma or microaggression. Clinical implications are also discussed.     

Search performance with discrete-cell stimulus arrays: filtered naturalistic images and probabilistic markers

In order to partially fill the gap between search studies with artificial and naturalistic stimuli, experiments with segmented and spatially filtered images of real stimuli in the discrete cells of search arrays were conducted. RT × set size functions obtained with the spatially filtered arrays were compared with those obtained with geometric and other types of arrays. With the aid of Fourier analysis, components of target certainty/uncertainty, target-distractor similarity/dissimilarity, and distractor homogeneity/heterogeneity were evaluated for their effects on search performance and efficiency. The comparative effects of valid/invalid and ambiguous/unambiguous markers of search items were included in the experiments to probe the potential contributions of top-down and bottom-up control to search with naturalistic stimuli. Visual coding in the form of spatial frequency passbands and top-down preferences for distractor search were used to explain the results.