Modeling and estimating recall processing capacity: Sensitivity and diagnostic utility in application to mild cognitive impairment

We investigate the potential for using latency-based measures of retrieval processing capacity to assess changes in performance specific to individuals with mild cognitive impairment (MCI), a reliable precursor state to Alzheimer’s Disease. Use of these capacity measures is motivated in part by exploration of the effects of atrophy on a computational model of a basic hippocampal circuit. We use this model to suggest that capacity may be a more sensitive indicator of the underlying atrophy than speed of processing, and test this hypothesis by adapting a standard behavioral measure of memory (the free and cued selective reminding test, FCSRT) to allow for the collection of cued recall latencies. Participants were drawn from five groups: college-aged, middle-aged, healthy elderly, those with a diagnosis of MCI, and a sample of MCI control participants. The measure of capacity is shown to offer increased classificatory sensitivity relative to the standard behavioral measures, and is also shown to be the behavioral measure that correlated most strongly with hippocampal volume.     

Direct Comparison of Episodic Encoding and Retrieval of Words: An Event-related fMRI Study

Functional magnetic resonance imaging (fMRI) was used to compare directly episodic encoding and retrieval. During encoding, subjects studied visually presented words and reported via keypress whether each word represented a pleasant or unpleasant concept (intentional, deep encoding). During the retrieval phase, subjects indicated (via keypress) whether visually presented words had previously been studied. No reliable differences were found during the recognition phase for words that had been previously studied and those that had not been studied. Areas preferentially active during encoding (relative to retrieval) included left superior frontal cortex, medial frontal cortex, left superior temporal cortex, posterior cingulate, left parahippocampal gyrus, and left inferior frontal gyrus. Regions more active in retrieval than encoding included bilateral inferior parietal cortex, bilateral precuneus, right frontal polar cortex, right dorsolateral prefrontal cortex, and right inferior frontal/insular cortex.     

The Roles of Explanation and Feedback in False Belief Understanding: A Microgenetic Analysis

The authors examined effects of feedback and explanation on false belief performance. Thirty-three children (42–54 months; 15 girls, 18 boys) were randomly assigned to four treatment conditions: explanation, feedback, feedback researcher explains, and feedback child explains. Children completed false belief tasks during pretraining, 8 training sessions, and posttraining across 6 weeks. Language comprehension was assessed at pretraining. The authors hypothesized that children would improve most when training involved feedback and explanation. Generalized estimating equations modeling was used to analyze the data. Children who received feedback and generated explanations for characters’ false beliefs improved across training sessions more so than children in other conditions. Children's explanations for false beliefs also were explored. Implications of the findings are discussed.     

Utilitarian epistemology

Standard epistemology takes it for granted that there is a special kind of value: epistemic value. This claim does not seem to sit well with act utilitarianism, however, since it holds that only welfare is of real value. I first develop a particularly utilitarian sense of “epistemic value”, according to which it is closely analogous to the nature of financial value. I then demonstrate the promise this approach has for two current puzzles in the intersection of epistemology and value theory: first, the problem of why knowledge is better than mere true belief, and second, the relation between epistemic justification and responsibility.     

Intensive video gaming improves encoding speed to visual short-term memory in young male adults

The purpose of this study was to measure the effect of action video gaming on central elements of visual attention using Bundesen's (1990) Theory of Visual Attention.To examine the cognitive impact of action video gaming, we tested basic functions of visual attention in 42 young male adults. Participants were divided into three groups depending on the amount of time spent playing action video games: non-players (< 2 h/month, N = 12), casual players (4–8 h/month, N = 10), and experienced players (> 15 h/month, N = 20). All participants were tested in three tasks which tap central functions of visual attention and short-term memory: a test based on the Theory of Visual Attention (TVA), an enumeration test and finally the Attentional Network Test (ANT). The results show that action video gaming does not seem to impact the capacity of visual short-term memory. However, playing action video games does seem to improve the encoding speed of visual information into visual short-term memory and the improvement does seem to depend on the time devoted to gaming. This suggests that intense action video gaming improves basic attentional functioning and that this improvement generalizes into other activities. The implications of these findings for cognitive rehabilitation training are discussed.     

Continuity in Representation Between Children and Adults: Arithmetic Knowledge Hinders Undergraduates' Algebraic Problem Solving

This study examined if solving arithmetic problems hinders undergraduates' accuracy on algebra problems. The hypothesis was that solving arithmetic problems would hinder accuracy because it activates an operational view of equations, even in educated adults who have years of experience with algebra. In three experiments, undergraduates (N = 184) solved addition facts or participated in one of several control conditions. Those who solved addition facts were less likely to solve prealgebra equations (e.g., 6 + 8 +4 = 7 + __) correctly under speeded conditions. In a fourth experiment, the negative effects of solving arithmetic problems extended to undergraduates (N = 74) solving algebra problems with no time pressure. Taken together, results suggest that arithmetic activates knowledge that hinders performance on algebra problems. Thus, an operational view of equations, which is prevalent in children, does not seem to be revised or abandoned, even after years of experience with algebra.     

Governmentality, Critical Scholarship, and the Medical Humanities

Foucault's work has had a profound impact on the medical humanities over the last decade or so. However, most work to date has focused on Foucault's earlier writings rather than his later contributions on the self and governmentality. This article assesses the significance of the concept of governmentality for critical scholarship in the medical humanities, particularly in creating ethical awareness in the field of health care. It examines the context for Foucault's later work, and contributions arising from scholarship building on this work. The governmentality literature, it is argued, raises novel questions about the ways we have come to think about health care in late modern societies. However, there are some limitations with this body of work which have not been fully acknowledged by scholars. The article discusses some of these limitations and offers some suggestions for a fruitful way forward.     

Assessing Conventional Wisdom about Religion and Politics: A Preliminary View from the Pews

Given religious leaders’ frequent opportunities to communicate to a large and receptive audience, political messages delivered during religious services have the potential to make a considerable impact on American politics—with particular significance for political education and mobilization. Social scientists routinely conclude that such messages are indeed disseminated, a claim we test in this study. Is it in fact true that church– and temple–going Americans regularly receive political messages from their ministers, priests, and rabbis during worship services? If so, what forms do these pronouncements take? How intense are they? Is this communication limited to messages from the service leader or does it come from other parts of the service, either informal or ritualistic? Existing empirical assessments of this topic depend heavily on survey research, asking congregants (or, less often, members of the clergy) about the frequency and content of political messages. Although such studies are certainly valuable, we approach religious political communications in a more immediate way: by observing them directly. Our conclusions are based on two waves of attendance at weekly services during 1998–1999, varying by religious tradition and denomination, region, and other dimensions. We find that “political” messages, broadly defined, are indeed delivered quite often. However, content analysis of these messages reveals that they typically address matters of social justice and rarely other types of political activity or belief, such as specific public policies or civic involvement (including voting). Political references during services only very occasionally constituted calls to direct political action on the part of the worshiper. Ultimately, our findings suggest that political content does occur relatively frequently during U.S. religious services, supporting the accounts of other social scientists. Our analysis offers new insight as to the content and nature of the political messages Americans are exposed to during religious services.     

Composition as pattern

Philosophical Studies - I argue for patternism, a new answer to the question of when some objects compose a whole. None of the standard principles of composition comfortably capture our natural...