The quantitative measure of pattern representation in images using orientation-specific color aftereffects

A quantitative method is developed for assessing the quality of pattern information in imagery, using the magnitude of color aftereffects as an objective index. Subjects were given instructions to project imagined bar patterns of particular width and orientation onto adapting color fields, in such a manner as to simulate standard conditions for establishing the McCollough effect. Our control procedures indicate that the resulting orientation-specific complementary color aftereffects cannot be attributed to the conditioning of particular directions of eye scanning movements to color processing during adaptation, or to other possible sources of experimental bias. Furthermore, subjects who rated themselves prior to the adaptation procedure as having relatively vivid imagery showed significantly larger aftereffects than those who reported having relatively low imagery. These results not only provide an important confirmation of our earlier finding that imagination can replace physical pattern information in the formation of basic color-feature associations in the human visual system, but also demonstrate that these aftereffects can provide a practical measure of the fidelity of pattern representation in visual images.     

The instructional information processing account of digital computation

What is nontrivial digital computation? It is the processing of discrete data through discrete state transitions in accordance with finite instructional information. The motivation for our account is that many previous attempts to answer this question are inadequate, and also that this account accords with the common intuition that digital computation is a type of information processing. We use the notion of reachability in a graph to defend this characterization in memory-based systems and underscore the importance of instructional information for digital computation. We argue that our account evaluates positively against adequacy criteria for accounts of computation.     

Dissociation of event-related potentials indexing arousal and semantic cohesion during emotional word encoding

Event-related potential (ERP) studies have shown that emotional stimuli elicit greater amplitude late positive-polarity potentials (LPPs) than neutral stimuli. This effect has been attributed to arousal, but emotional stimuli are also more semantically coherent than uncategorized neutral stimuli. ERPs were recorded during encoding of positive, negative, uncategorized neutral, and categorized neutral words. Differences in LPP amplitude elicited by emotional versus uncategorized neutral stimuli were evident from 450 to 1000 ms. From 450 to 700 ms, LPP effects at midline and right hemisphere frontal electrodes indexed arousal, whereas LPP effects at left hemisphere centro-parietal electrodes indexed semantic cohesion. This dissociation helps specify the processes underlying emotional stimulus encoding, and suggests the need to control for semantic cohesion in emotional information processing studies.     

Acquired physical disability: Personal meanings in a rural South African setting

This study explored personal meanings attached to acquired physical disabilities in a rural South African community. Informants were seven adults with disability (females?=?4; age range?=?18 to 55 years). They responded to semi-structured face-to-face interviews on the meanings they attached to their physical disabilities acquired during adulthood. Four themes emerged from the thematic analysis: new life style, activity limitations, participation restrictions, and cultural marginalisation. The meanings and accompanying lifestyle changes have implications for personal functioning and social well-being.     

Film Review

Tell Me Who Is Haunting You and I'll Tell You Who You Are. A Reading of the film Sixth Sense dir. M. Night Shyamalan (1999)     

The narcissistic difficulties presented to the observer by the psychosomatic problem1

Dealing with psychosomatic realities often generates narcissistic neurotic resistances in the observer that form an obstacle to carrying out scientific work. The tendencies towards schematization and the enforced investigation of arbitrarily defined objects of study, such as they appear in some theoretical standpoints, are aspects of these resistances. The self-destruction evoked by the problem of the ‘death drives’ in its superficial dimension constitutes an obstacle of the same kind.     

Irrational beliefs that can lead to academic failure for African American middle school students who are academically at-risk

This article describes how rational emotive behavior therapy and other cognitive-behavioral therapies can be used to improve the achievement of academically at-risk African American students at the middle-school level. Definitions of at-risk and a review of relevant literature are provided. This article offers an outline of several main irrational beliefs that can lead to academic failure for African American students at the middle-school level. This author suggested that escalating preferences for justice, acceptance within the African American community, and acceptance by European Americans are at the core for causing academic failure for many of these students. The author describes empirical data which show that once these students learn a realistic philosophy of life—to be more rational, tolerant, nonutopian, and nondemanding—the students improve in their academic self-concept and achievement.