Hans Reichenbach,radio philosopher: a preliminary report

Synthese - This essay looks at some of the key aspects of Hans Reichenbach’s career as a radio engineer, broadcaster, and producer. It argues that some of the themes of Reichenbach’s...     

Influence of stimulus amplitude on unintended visuomotor entrainment

Rhythmic limb movements have been shown to spontaneously coordinate with rhythmic environmental stimuli. Previous research has demonstrated how such entrainment depends on the difference between the movement periods of the limb and the stimulus, and on the degree to which the actor visually tracks the stimulus. Here we present an experiment that investigated how stimulus amplitude influences unintended visuomotor entrainment. Participants performed rhythmic forearm movements while visually tracking an oscillating stimulus. The amplitude and period of stimulus motion were manipulated. Larger stimulus amplitudes resulted in stronger entrainment irrespective of how participants visually tracked the movements of the stimulus. Visual tracking, however, did result in increased entrainment for large, but not small, stimulus amplitudes. Collectively, the results indicate that the movement amplitude of environmental stimuli plays a significant role in the emergence of unintended visuomotor entrainment.     

Age Trends in Eidetikers

The entire available population (N = 408) of a primary school in Perth, Western Australia, was tested for eideticism using a slightly modified presentation of the Haber and Haber (1964) procedure. Sixteen eidetikers were found in the age range covered (5–13 years). When classified into four age categories (5–6, 7–8, 9–10, 11–13), the number of eidetikers in relation to noneidetikers showed a statistically significant and systematic decline with increasing age. These results are discussed in relation to their possible significance for a theory of eidetic development.     

Cerebral perfusion in chronic stroke: implications for lesion-symptom mapping and functional MRI

Lesion-symptom mapping studies are based upon the assumption that behavioral impairments are directly related to structural brain damage. Given what is known about the relationship between perfusion deficits and impairment in acute stroke, attributing specific behavioral impairments to localized brain damage leaves much room for speculation, as impairments could also reflect abnormal neurovascular function in brain regions that appear structurally intact on traditional CT and MRI scans. Compared to acute stroke, the understanding of cerebral perfusion in chronic stroke is far less clear. Utilizing arterial spin labeling (ASL) MRI, we examined perfusion in 17 patients with chronic left hemisphere stroke. The results revealed a decrease in left hemisphere perfusion, primarily in peri-infarct tissue. There was also a strong relationship between increased infarct size and decreased perfusion. These findings have implications for lesion-symptom mapping studies as well as research that relies on functional MRI to study chronic stroke.     

'You’re Being Unreasonable’: Prior and Passing Theories of Critical Discussion

A key and continuing concern within the pragma-dialectical theory of argumentation is how to account for effective persuasion disciplined by dialectical rationality. Currently, van Eemeren and Houtlosser offer one response to this concern in the form of strategic manoeuvring. This paper offers a prior/passing theory of communicative interaction as a supplement to the strategic manoeuvring approach. Our use of a prior/passing model investigates how a difference of opinion can be resolved while both dialectic obligations of reasonableness and rhetorical ambitions of argumentative success are simultaneously accommodated. The paper explores the model with particular reference to the pragma-dialectical rules of critical discussion, strategic manoeuvring and fallacious reasoning.     

Period basin of entrainment for unintentional visual coordination

Researchers have demonstrated that a person's rhythmic movements can become unintentionally entrained to another person's rhythmic movements or an environmental event. There are indications, however, that in both cases the likelihood of entrainment depends on the difference between the uncoupled periods of the two rhythms. The authors examined the range of period differences over which unintentional visual coordination might occur in 16 participants (Experiment 1) and 15 participants (Experiment 2). Cross-spectral coherence analysis and the distribution of continuous relative phase revealed that visual entrainment decreased as the difference between participants' preferred period and the experimenter-determined period of the environmental stimulus increased. The present findings extend the dynamical systems perspective on person-environment coupling and highlight the significance of period difference to the emergence of unintentional coordination.     

Attention and executive function deficits in adolescent sex offenders.

Thirty male adolescent sex offenders and 20 age-matched male adolescents completed an extensive battery of attention and executive function tests. Controls were obtained from adolescents from a socially and economically deprived background, typical of the offending group. The attention battery was based on Mirksy, Anthony, Duncan, Ahearn, and Kellam (1991) and the executive function battery on Kelly (2000a). Successful matching for IQ was not achieved and therefore ANCOVA comparisons were made between the groups, with IQ as the covariate. In attention a highly significant difference was found on the focus-execute factor and a significant difference on the shift factor. In executive function there was a highly significant difference only on the response speed factor. In all cases better abilities were demonstrated by the control group. The importance of thorough neuropsychological investigation in the clinical assessment of this forensic group is supported. The clinical implications of neuropsychological deficits in terms of risk assessment and clinical management are discussed.     

Conceptions of learning,approaches to studying and personal development in UK higher education

Background Students in higher education are known to vary in their conceptions of learning, their approaches to studying, and the personal development and personal change that result. Aims This study aimed to explore the relationships among these four aspects of students' experience; to examine whether there were variations across academic subjects and across departments in each subject; and to explore whether there were changes from first year to after graduation. Sample Students in the first year and the final year of the undergraduate programmes at 15 departments, five offering each of three subjects: bioscience, business studies, and sociology. Method Participants completed a questionnaire containing four instruments and were given a similar questionnaire roughly two years later (when the entering students were in their third year, and when the exiting students were in their second year after graduation). Results The students' conceptions of learning showed a clear relationship with their approaches to studying, but the relationships with their personal development and personal change were much weaker. The students' scores were significantly related to age and gender and showed some significant differences across academic subjects and departments. However, there was little change in their scores over time. Conclusion Students' approaches to studying are influenced by their conceptions of learning and are relatively consistent across different contexts. In contrast, their reports of personal change and development seem to be determined by their implicit theories on entering higher education.