It is irrelevant,but it matters: Using confluence theory to predict the influence of beliefs on evaluations,attitudes, and intentions

The present research is based on the notion of confluence—that associated mental elements have a tendency to become more consistent with each other over time, even if some of them are logically irrelevant to the issue at hand. This idea was applied to a voting paradigm where participants were exposed to varying numbers of valenced beliefs about a candidate. Two experiments tested the idea that although valenced beliefs influence attributions and voting intentions, there is an additional process whereby evaluations of irrelevant beliefs also are influenced. Not surprisingly, as more positive or negative beliefs were presented, voting intentions became more positive or more negative, respectively. More dramatically, however, positive or negative evaluations of irrelevant beliefs became more extreme in the direction of the presented items as more of them were presented. An additional experiment tested alternative mechanisms. Copyright © 2012 John Wiley & Sons, Ltd.     

Environmental enrichment protects against the effects of chronic stress on cognitive and morphological measures of hippocampal integrity

Chronic stress has detrimental effects on hippocampal integrity, while environmental enrichment (EE) has beneficial effects when initiated early in development. In this study, we investigated whether EE initiated in adulthood would mitigate chronic stress effects on cognitive function and hippocampal neuronal architecture, when EE started one week before chronic stress began, or two weeks after chronic stress onset. Adult male Sprague Dawley rats were chronically restrained (6h/d) or assigned as non-stressed controls and subdivided into EE or non-EE housing. After restraint ended, rats were tested on a radial arm water maze (RAWM) for 2-d to assess spatial learning and memory. The first study showed that when EE began prior to 3-weeks of chronic stress, EE attenuated chronic stress-induced impairments in acquisition, which corresponded with the prevention of chronic stress-induced reductions in CA3 apical dendritic length. A second study showed that when EE began 2-weeks after the onset of a 5-week stress regimen, EE blocked chronic stress-induced impairments in acquisition and retention at 1-h and 24-h delays. RAWM performance corresponded with CA3 apical dendritic complexity. Moreover, rats in EE housing (control or stress) exhibited similar corticosterone profiles across weeks, which differed from the muted corticosterone response to restraint by the chronically stressed pair-housed rats. These data support the interpretation that chronic stress and EE may act on similar mechanisms within the hippocampus, and that manipulation of these factors may yield new directions for optimizing brain integrity and resilience under chronic stress or stress related neuropsychological disorders in the adult.     

Side Streets and U-Turns: Effects of Context Switching,Direction Switching,and Factor Switching on Interitem Correlations and Misresponse Rates

This study tested implications of the context switching perspective proposed by Hamby, Ickes, and Babcock (2016 Hamby, T., Ickes, W., &; Babcock, M. (2016). Evidence for context switching in the effects of average item length and item-length variability on internal consistency. Journal of Personality Assessment, 98, 491–502. doi:10.1080/00223891.2016.1147044[Taylor &; Francis Online], [Web of Science ®] , [Google Scholar]). Using trained raters to assess the amount of reframing required to interpret the meaning of the subsequent (second) item within all adjacent item pairs, we first established that this process variable could be measured reliably. Then, in the data for 18 personality measures drawn from 3 individual-difference domains, we found that the amount of reframing (i.e., context switching) needed to interpret successive items predicted both lower interitem correlations and a greater percentage of misresponders. Similarly, item pairs that were mismatched in “directional” wording also predicted both lower interitem correlations and more misresponders. Finally, item pairs representing different factors predicted lower interitem correlations. Although the effects of direction switching and factor switching were partially mediated by the amount of reframing required, they remained significant even when the mediating effect of reframing was statistically controlled. These results indicate that interpreting the meaning of test items is a task for which the level of difficulty can vary with each successive item, as a function of how the current item compares to the previous item in aspects such as its context generality or specificity, directional wording, and content domain.     

‘Mon petit essai’: Émilie du Châtelet’s Essai sur l’optique and her early natural philosophy

ABSTRACT

Émilie du Châtelet’s recently-discovered Essai sur l’optique offers new insights into her early natural philosophy. Here I analyse the Essai in detail, focusing on Du Châtelet’s use of attraction and her discussion of the laws governing it. These features of the Essai are crucial to her early thought. I also analyse how other contemporaneous sources augment the Essai, including her review of Voltaire’s Elémens and her correspondence with Maupertuis. These sources track her growing appreciation of the need for a metaphysical framework in science. I also discuss the Essai’s implications for key passages of the Institutions de physique.     

Multivariate pattern analysis and the search for neural representations

Synthese - Multivariate pattern analysis, or MVPA, has become one of the most popular analytic methods in cognitive neuroscience. Since its inception, MVPA has been heralded as offering much more...     

Early-life education may help bolster declarative memory in old age,especially for women

ABSTRACT

Although declarative memory declines with age, sex and education might moderate these weaknesses. We investigated effects of sex and education on nonverbal declarative (recognition) memory in 704 older adults (aged 58–98, 0–17 years of education). Items were drawings of real and made-up objects. Age negatively impacted declarative memory, though this age effect was moderated by sex and object-type: it was steeper for males than females, but only for real objects. Education was positively associated with memory, but also interacted with sex and object-type: education benefited women more than men (countering the age effects, especially for women), and remembering real more than made-up objects. The findings suggest that nonverbal memory in older adults is associated negatively with age but positively with education; both effects are modulated by sex, and by whether learning relates to preexisting or new information. The study suggests downstream benefits from education, especially for girls.