Latencies of stimulus-driven eye movements are shorter in dyslexic subjects

Eye movements latencies toward peripherally presented stimuli were measured in 10-year-old dyslexic and control children. Dyslexic subjects, previously found to be oversensitive to stimulation of the magnocellular channel, showed reduced latencies as compared to normally reading controls. An attention shifting task was also used which showed no group differences in latencies of eye movements. The data are discussed in terms of the hypothesis of magnocellular system alteration and attention dysfunction in dyslexia. Additionally, sex differences in eye movement latencies were found and are discussed.     

Transmission arguments against knowledge closure are still fallacious

Transmission arguments against closure of knowledge base the case against closure on the premise that a necessary condition for knowledge is not closed. Warfield argues that this kind of argument is fallacious whereas Brueckner, Murphy and Yan try to rescue it. According to them, the transmission argument is no longer fallacious once an implicit assumption is made explicit. I defend Warfield’s objection by arguing that the various proposals for the unstated assumption either do not avoid the fallacy or turn the central premise of the transmission argument, namely that a necessary condition is not closed, into a redundant and superfluous premise. I conclude that Warfield’s advice is still to be heeded: Arguments against closure must not rely essentially on the premise that a necessary condition for knowledge is not closed.     

Explaining avoidance: two factors are still better than one.

Two-factor theory remains a viable account of avoidance behavior. By emphasizing the interplay of respondent and operant contingencies, two-factor theory encourages the analysis of stimuli that mediate molar consequences and incorporates control by local events as well as events that are temporally remote, improbable, or cumulative.     

We are still better than them: A longitudinal field study of ingroup favouritism during a merger

The authors examine the impact of predictors for ingroup favouritism and a positive attitude towards a university merger by conducting a longitudinal field study investigating students' perceptions of a merger. Thus, the focus of this paper lies on the developmental and dynamic aspect of social identity processes and the test of directional hypotheses in an applied setting. Based on a cross‐lagged regression approach, it was shown that pre‐merger identification increased favouritism, but favouritism also increased pre‐merger identification. Moreover, ingroup favouritism was uni‐directionally related to a negative attitude towards the merger. Contact with the merger partner revealed lagged effects on ingroup favouritism. These results confirm that issues of identity change and compatibility are crucial aspects in understanding merger adjustment and support. Copyright © 2009 John Wiley & Sons, Ltd.     

Getting a little closure for closure

Synthese - In this paper, I’ll survey a number of closure principles of epistemic justification and find them all wanting. However, it’ll be my contention that there’s a novel...     

Parity still isn't a generalisation problem

Clark & Thornton take issue with my claim that parity is not a generalisation problem, and that nothing can be inferred about back-propagation in particular, or learning in general, from failures of parity generalisation. They advance arguments to support their contention that generalisation is a relevant issue. In this continuing commentary, I examine generalisation more closely in order to refute these arguments. Different learning algorithms will have different patterns of failure: back-propagation has no special status in this respect. This is not to deny that a particular algorithm might fortuitously happen to produce the "intended" function in an (oxymoronic) parity-generalisation task.     

Texture-based tasks are little affected by second tasks requiring peripheral or central attentive fixation.

Experiments are described in which observers attempted to perform concurrently two separate visual tasks. Two types of tasks were used: the identification of a T-shaped or L-shaped letter target, and the detection or localization of a texture element of unique orientation (texture target) within a dense texture. Combining these tasks to form various task pairs, performance as a function of stimulus onset asynchrony (SOA) was established separately for each task in a pair. In addition, performance was measured when each task was carried out by itself. When paired, two identification tasks (T or L) on (two) letter targets required a significantly larger SOA than either identification task by itself. This outcome suggests the involvement of serial performance and competition for a limited resource, confirming that letter identification requires attentive fixation. However, when the identification of a central letter target was paired with the localization (upper or lower hemifield) of an eccentric texture target, performance in the pair was comparable to performance of each task by itself. This suggests parallel performance and a lack of conflict over resources. The outcome was similar when the identification of an eccentric letter target was paired with the detection (present or absent) of an eccentric texture target. These results are consistent with the possibility that localization and detection of a textural singularity do not require attentive fixation.     

One little boy

Pastoral Psychology -     

Make mild moments memorable: add a little arousal

In a recent paper Anderson and colleagues reported that emotionally arousing stimuli enhance long-term memory of immediately preceding neutral stimuli. The findings fit well with the perseveration-consolidation hypothesis and with extensive evidence from both human and animal studies indicating that arousal-induced modulation of memory is mediated by beta-noradrenergic activation of the amygdala.     

Notes and shorter communications: Psychoticism and unemployment

The Eysenck Personality Questionnaire (EPQ) was given to male skilled and semi-skilled workers facing redundancy, in an attempt to ascertain whether any of the factors measured contributed towards a predispositional tendency for unemployment. Psychoticism was found to be a sound predictor of future work status for the school group, whilst no differences of merit were noted for any variable for the redundant group. The results are discussed in relation to other findings with regard to EPQ trait factors, and in particular to Psychoticism.     

The little obsessional alchemist

Using the psychoanalytic experience with an obsessional child, this paper looks at the moment of insight, that precipitation of coherence which occurs when we say that we suddenly realize something. This is contrasted with the approach of consciously trying to fit theory to the observed facts. Analogies with alchemy are drawn. In addition, the balancing process occurring in obsessional mentality is compared with strangulation by hanging, the opposing forces being comprised of prematurely solidified states of mind such as mania or paranoia which interfere with that fluid state of mind optimal for the precipitation of insight.     

Why we still need a mark of the cognitive

What makes a process a cognitive process? I’m not just asking for a list of cognitive processes, but for what makes an item on that list a cognitive process. Why should it be on the list? This is a question that has been ignored far too long in the domain of research calling itself cognitive science. It is time to give an answer and that is what I propose in this paper. I contrast my answer with others that have been given and defend the need against some claims in the literature that a mark of the cognitive is not needed.