Social factors influence haloperidol-induced catalepsy in rat

This study employed manipulations which presumably influence social interactions in rats: (1) paired housing with a heavier conspecific and (2) exposure to the odors of other rats. The dependent variable was the akinetic state induced by haloperidol, a neuroleptic and dopamine antagonist. In Experiment 1, adult male Long-Evans hooded rats were matched by weight and caged alone or in pairs with one rat 30 g heavier than its cagemate. All rats received haloperidol (1.5 mg/kg) and catalepsy testing. Heavy rats showed more catalepsy than the lighter member of pairs or weight-matched, singly housed controls. In Experiment 2, adult male rats were left unrecaged or were recaged into cages with bedding recently soiled by females or other adult males. After haloperidol (1.0 mg/kg), the rats exposed to bedding soiled by other adult males showed more catalepsy than did the control groups. Thus, the results of both experiments indicated that social factors can influence the akinesia induced by dopamine antagonists.     

Characterizing cognition in ADHD: beyond executive dysfunction

The hypothesis that Attention-Deficit/Hyperactivity Disorder (ADHD) reflects a primary inhibitory executive function deficit has spurred a substantial literature. However, empirical findings and methodological issues challenge the etiologic primacy of inhibitory and executive deficits in ADHD. Based on accumulating evidence of increased intra-individual variability in ADHD, we reconsider executive dysfunction in light of distinctions between 'hot' and 'cool' executive function measures. We propose an integrative model that incorporates new neuroanatomical findings and emphasizes the interactions between parallel processing pathways as potential loci for dysfunction. Such a reconceptualization provides a means to transcend the limits of current models of executive dysfunction in ADHD and suggests a plan for future research on cognition grounded in neurophysiological and developmental considerations.     

Finger-digit compatibility in Arabic numeral processing

Finger-digit response compatibility was tested by asking participants to identify Arabic digits by pressing 1 of 10 keys with all 10 fingers. The direction of the finger-digit mapping was varied by manipulating the global direction of the hand-digit mapping as well as the direction of the finger-digit mapping within each hand (in each case, from small to large digits, or the reverse). The hypothesis of a left-to-right mental number line predicted that a complete left-to-right mapping should be easier whereas the hypothesis of a representation based on finger counting predicted that a counting-congruent mapping should be easier. The results show that when all 10 fingers are used to answer, a mapping congruent with the prototypical finger-counting strategy reported by the participants leads to better performance than does a mapping congruent with a left-to-right oriented mental number line, both in palm-down and palm-up postures of the hands, and they demonstrate that finger-counting strategies influence the way that numerical information is mentally represented and processed.     

Coordination of voluntary and stimulus-driven attentional control in human cortex

Visual attention may be voluntarily directed to particular locations or features (voluntary control), or it may be captured by salient stimuli, such as the abrupt appearance of a new perceptual object (stimulus-driven control). Most often, however, the deployment of attention is the result of a dynamic interplay between voluntary attentional control settings (e.g., based on prior knowledge about a target's location or color) and the degree to which stimuli in the visual scene match these voluntary control settings. Consequently, nontarget items in the scene that share a defining feature with the target of visual search can capture attention, a phenomenon termed contingent attentional capture. We used functional magnetic resonance imaging to show that attentional capture by target-colored distractors is accompanied by increased cortical activity in corresponding regions of retinotopically organized visual cortex. Concurrent activation in the temporoparietal junction and ventral frontal cortex suggests that these regions coordinate voluntary and stimulus-driven attentional control settings to determine which stimuli effectively compete for attention.     

Perceived COVID-induced racism and contextual predictors of fear and psychological distress among Black men

The present study examined if Black men's perceptions of COVID-induced racism (i.e., the extent to which racism increased during the beginning months of the COVID-19 pandemic) were associated with their reported fear of COVID-19 and psychological distress. Self-report COVID-related variables and psychological distress data from 231 Black men in the U.S. were analyzed alongside archival percentages of confirmed cases and deaths by participants' county at the time of participation. Hierarchical regressions identified perceptions of COVID-induced racism as a significant predictor of Black men's psychological distress over and above contextual (e.g., county-level COVID-19 case %) and individual-level predictors (i.e., perceived race-related infection risk and self-reported COVID-related stressful life events). This work contributes to the growing literature on health inequities during the COVID-19 pandemic with a snapshot of Black men's experiences during the COVID-19 and racism pandemics of 2020 in the U.S.     

The perceived impact of tax and regulatory changes

People believe that shared events, events that impact everyone to the same degree, will nonetheless impact them more than others. Across four studies we examined whether this impacts people's reactions to proposed changes to tax and regulatory policies. We found that participants thought that tax (Study 1a and 1b) and regulatory (Study 2) changes would have more of an impact on their own lives than on the lives of people in their same financial situation. We then examined whether these findings are the product of a broad focalism bias or its narrower relative, egocentrism. Because we observed the bias both when participants were asked about their own financial situation or that of someone else, the former appears to be the better explanation (Study 3). We discuss the implications of this bias for people's willingness to embrace policy proposals designed to advance the common good.     

Eastern versus Western Control Beliefs at Work: An Investigation of Secondary Control, Socioinstrumental Control, and Work Locus of Control in China and the US

La théorie et la recherche concernant les croyances (LOC) et les perceptions du contrôle suggèrent que les Asiatiques tendent à obtenir des scores plus bas et àêtre plus passifs que les Américains, mais ces travaux ont été menés à l’aide de concepts et d’échelles développés principalement aux USA qui certifient une primauté du contrôle interne (ex: en changeant l’environnement pour l’adapter à soi). Une équipe de recherche internationale a étendu la notion de croyance dans le contrôle en développant des échelles qui permettent de reconsidérer la notion en faisant état de croyances secondaires dans le contrôle (ex: en adaptant le soi à l’environnement) et de faire état d’un concept nouveau de croyances socio‐instrumentales (ex: le contrôle par les relations interpersonelles) qui permettent de rendre compte de manière plus pertinente des croyances en un contrôle dans les cultures collectivistes. Nous nous attendions à ce que, par l’utilisation d’échelles culturellement appropriées, les Américains n’obtiennent pas une croyance en un contrôle plus importante que les Asiatiques. Les hypothèses ont été partiellement confirmées en ce que les Américains se sont montrés comme obtenant un contrôle plus bas que les Chinois (de Hong Kong et de RP de Chine) sur ces échelles. Il est suggéré que voir les Asiatiques comme évitant passivement le contrôle au travail peut être incorrect et dû aux insuffisances de contrôle socio‐instrumental. Research and theory concerning beliefs (locus of control) and perceptions of control suggest that Asians tend to be lower and more passive than Americans, but this work has been conducted mainly with US‐developed constructs and scales that assess primary control (i.e. changing the environment to adapt to the self). An international research team expanded the notion of control beliefs by developing scales to assess secondary control beliefs (i.e. adapting the self to the environment) and the new construct of socioinstrumental control beliefs (i.e. control via interpersonal relationships), both of which were thought to better fit the control beliefs of collectivist cultures than Western‐developed control scales. We expected that, when culturally appropriate scales were employed, Americans would not show higher control beliefs than Asians. Hypotheses were partially confirmed that Americans would be lower than Chinese (Hong Kong and PR China) on these new scales. It is suggested that views of Asians as passive avoiders of control at work may be incorrect and due to the overlooking of socioinstrumental control.     

The mental representation of the magnitude of symbolic and nonsymbolic ratios in adults

This study mainly investigated the specificity of the processing of fraction magnitudes. Adults performed a magnitude-estimation task on fractions, the ratios of collections of dots, and the ratios of surface areas. Their performance on fractions was directly compared with that on nonsymbolic ratios. At odds with the hypothesis that the symbolic notation impedes the processing of the ratio magnitudes, the estimates were less variable and more accurate for fractions than for nonsymbolic ratios. This indicates that the symbolic notation activated a more precise mental representation than did the nonsymbolic ratios. This study also showed, for both fractions and the ratios of dot collections, that the larger the components the less precise the mental representation of the magnitude of the ratio. This effect suggests that the mental representation of the magnitude of the ratio was activated from the mental representation of the magnitude of the components and the processing of their numerical relation (indirect access). Finally, because most previous studies of fractions have used a numerical comparison task, we tested whether the mental representation of magnitude activated in the fraction-estimation task could also underlie performance in the fraction-comparison task. The subjective distance between the fractions to be compared was computed from the mean and the variability of the estimates. This distance was the best predictor of the time taken to compare the fractions, suggesting that the same approximate mental representation of the magnitude was activated in both tasks.     

Working Memory Capacity and Learning Underlying Conceptual Relationships Across Multiple Documents

A common usage of textual repositories of information is to seek out and gather important information for a specific learning goal. However, not all material is organized in a single location, and users are often forced to visit multiple pages or sources to develop understanding. In these situations, are different learners more or less sensitive to drawing the underlying connections between multiple documents, which are relevant for the eventual learning goals? This study examines the performance of undergraduates who vary in working memory capacity as they were asked to learn about plants from a Wiki‐like website. Participants were pretested on their knowledge of both biology and the plant kingdom. Results indicate that learning underlying conceptual structure is indeed predicted by working memory, but not prior knowledge. This suggests that individual characteristics should be considered when designing learning technologies in the future. Copyright © 2012 John Wiley & Sons, Ltd.