Paying attention to reading errors in acquired dyslexia

The important role of selective attention in normal reading is illustrated by a relatively rare form of acquired dyslexia known as 'attentional dyslexia'. Theories of the functional deficit underlying this disorder differ as to the locus of the attentional dysfunction. A recent study by Mayall and Humphreys has contributed to this debate by studying letter migration errors in an attentional dyslexic.     

A Challenge to Brink's Metaphysical Egoism

Those who subscribe to aprudential conception of practical reason do not believe that there is a conflict between other-regarding and self-regarding norms as the former are held to be founded on the latter. Moral conduct, they maintain, is always rationally justifiable. The reasons we should fulfil the demands of other-regarding norms are the same as those we have for fulfilling self-regarding norms. David Brink has put forth an interesting and novel account of this approach to practical reason which he calls‘metaphysical egoism’. Metaphysical egoism requires that we modify our pre-theoretical understandings of self-interest on metaphysical grounds. I critically assess Brink’s argument and claim that metaphysical egoism does not adequately function as a motive or guide for action. It is susceptible to many of the same problems which strategic egoism faces. This revised version was published online in July 2006 with corrections to the Cover Date.     

Inter‐racial contact and the own‐race bias for face recognition in South Africa and England

Own‐race bias, where people are more accurate recognizing faces of people from their own race than other races, can lead to misidentification and, in some cases, innocent people being convicted. This bias was explored in South Africa and England, using Black and White participants. People were shown several photographs of Black and White faces and were later asked if they had seen these faces (and several fillers). In addition, participants were given a questionnaire about inter‐racial contact. Cross‐race identification accuracy for Black participants was positively correlated with self‐reported inter‐racial contact. The confidence–accuracy relationship was strongest when making own‐race judgements. Copyright © 2003 John Wiley & Sons, Ltd.     

Training on integrated versus separated Stroop tasks: The progression of interference and facilitation

Two experiments examined the course of interference and facilitation in the Stroop (1935) task during training. Two versions of the task were compared: integrated (e.g., the word RED in the color green) and separated (e.g., green asterisks above the word RED). Stimuli were congruent (RED in red), incongruent (GREEN in red), or neutral (XXX in red). Over 5-day (Experiment 1) and 10-day (Experiment 2) training sessions, facilitation due to congruence was small, stable, and equivalent in both task versions. In contrast, interference declined sharply on the integrated task over Days 1-3, then slowed to parallel the gradual decline on the separated task. Finally, training on the color naming task did not affect a word reading task administered after training. These findings imply that (a) Stroop interference initially reflects two problems—overcoming integration and managing two conflicting information sources; (b) with practice, the larger integration problem is solved relatively quickly, rendering the integrated and separated tasks quite comparable thereafter; and (c) facilitation and interference in the Stroop task may be independent. These results challenge extant theories of the Stroop effect, which do not predict such effects.     

Bayesian rules of updating

This paper discusses the Bayesian updating rules of ordinary and Jeffrey conditionalisation. Their justification has been a topic of interest for the last quarter century, and several strategies proposed. None has been accepted as conclusive, and it is argued here that this is for a good reason; for by extending the domain of the probability function to include propositions describing the agent's present and future degrees of belief one can systematically generate a class of counterexamples to the rules. Dynamic Dutch Book and other arguments for them are examined critically. A concluding discussion attempts to put these results in perspective within the Bayesian approach.This paper was completed with assistance from a Mind Association Fellowship. I would like to thank the Mind Association, and also Paul Castell for his patient advice on previous drafts.     

The influence of texture on judgments of slant and relative distance in a picture with suggested depth

Six surfaces from natural environments with different visual textures were photographed at angles of 60, 65, and 70 deg from perpendicular. Measurements were taken of 24 Ss’ judgments of the inferred angles of slant and inferred midpoints of the six textured surfaces represented in the photographs which were viewed in the frontoparallel plane. Judgments of both slant and relative distance within the photographs were influenced by represented angle of slant and by variations in surface texture.     

Variations in size judgements as a function of surface texture

Adult subjects made monocular size judgements in two experiments in which the independent variables of surface texture and restrictions on viewing conditions were manipulated. Texture density gradients of stimulation had a significant influence of size judgements only under the less reduced conditions of observation when subjects could see other textured surfaces beyond the surfaces over which judgements were made. Identical manipulations of surface texture had earlier been found to have a highly significant influence on relative distance judgements (Newman, 1971). The principally negative results were thus taken to imply that subjects extract different information from the texture density gradient when judging size from that extracted when judging relative distance.