Evidence for spontaneous serial refreshing in verbal working memory?

Working memory (WM) keeps information temporarily accessible for ongoing cognition. One proposed mechanism to keep information active in WM is refreshing. This mechanism is assumed to operate by bringing memory items into the focus of attention, thereby serially refreshing the content of WM. We report two experiments in which we examine evidence for the spontaneous occurrence of serial refreshing in verbal WM. Participants had to remember series of red letters, while black probe letters were presented between these memory items, with each probe to be judged present in or absent from the list presented so far, as quickly as possible (i.e., the probe–span task). Response times to the probes were used to infer the status of the representations in WM and, in particular, to examine whether the content of the focus of attention changed over time, as would be expected if serial refreshing occurs spontaneously during inter-item pauses. In sharp contrast with this hypothesis, our results indicate that the last-presented memory item remained in the focus of attention during the inter-item pauses of the probe–span task. We discuss how these findings help to define the boundary conditions of spontaneous refreshing of verbal material in WM, and discuss implications for verbal WM maintenance and forgetting.     

Individual differences in dopamine D<Subscript>2</Subscript> receptor availability correlate with reward valuation

Reward valuation, which underlies all value-based decision-making, has been associated with dopamine function in many studies of nonhuman animals, but there is relatively less direct evidence for an association in humans. Here, we measured dopamine D₂ receptor (DRD2) availability in vivo in humans to examine relations between individual differences in dopamine receptor availability and neural activity associated with a measure of reward valuation, expected value (i.e., the product of reward magnitude and the probability of obtaining the reward). Fourteen healthy adult subjects underwent PET with [¹⁸F]fallypride, a radiotracer with strong affinity for DRD2, and fMRI (on a separate day) while performing a reward valuation task. [¹⁸F]fallypride binding potential, reflecting DRD2 availability, in the midbrain correlated positively with neural activity associated with expected value, specifically in the left ventral striatum/caudate. The present results provide in vivo evidence from humans showing midbrain dopamine characteristics are associated with reward valuation.     

Decay theory of immediate memory: From Brown (1958) to today (2014)

This work takes a historical approach to discussing Brown's (1958) paper, “Some Tests of the Decay Theory of Immediate Memory”. This work was and continues to be extremely influential in the field of forgetting over the short term. Its primary importance is in establishing a theoretical basis to consider a process of fundamental importance: memory decay. Brown (1958) established that time-based explanations of forgetting can account for both memory capacity and forgetting of information over short periods of time. We discuss this view both in the context of the intellectual climate at the time of the paper's publication and in the context of the modern intellectual climate. The overarching theme we observe is that decay is as controversial now as it was in the 1950s and 1960s.     

Separating cognitive capacity from knowledge: a new hypothesis

We propose that working memory and reasoning share related capacity limits. These limits are quantified in terms of the number of items that can be kept active in working memory, and the number of interrelationships between elements that can be kept active in reasoning. The latter defines the complexity of reasoning problems and the processing loads they impose. Principled procedures for measuring, controlling or limiting recoding and other strategies for reducing memory and processing loads have opened up new research opportunities, and yielded orderly quantification of capacity limits in both memory and reasoning. We argue that both types of limit might be based on the limited ability to form and preserve bindings between elements in memory.     

WOMEN'S HOSTILITY TOWARD WOMEN

Three studies investigating the self-report correlates of women's hostility toward other women were conducted among a total of 477 college women. In Study 1, hostility toward women was negatively associated with both personal and collective self-esteem and positively associated with hostility toward men, controlling for state anger. In Study 2, hostility toward women was negatively associated with self-efficacy and age and positively associated with emotional dependence on men, but not with self-identification as a feminist or support of the feminist movement. In Study 3, women's hostility toward women was negatively associated with measures of intimacy and life satisfaction and positively associated with acceptance of interpersonal violence. We suggest that women's hostility toward other women not only is an important aspect of women's personal satisfaction, happiness, intimacy, and self-esteem, but also may serve as a barrier to women's progress as a group.     

RACISM AND SEXISM IN INTERRACIAL PORNOGRAPHY A Content Analysis

Racism and sexism were examined in interracial (Black/White) X-rated pornography videocassettes. Five female coders coded 476 characters in the sexually explicit scenes in 54 videos. Characters were coded on aggregate measures of physical and verbal aggression, inequality cues, racial cues, and intimacy cues, as well as other specific indices. Sexism was demonstrated in the unidirectional aggression by men toward women. Racism was demonstrated in the lower status of Black actors and the presence of racial stereotypes. Racism appeared to be expressed somewhat differently by sex, and sexism somewhat differently by race. For example, Black women were the targets of more acts of aggression than were White women, and Black men showed fewer intimate behaviors than did White men. More aggression was found in cross-race sexual interactions than in same-race sexual interactions. These findings suggest that pornography is racist as well as sexist.