Pattern orientation, not motion, determines the two-dimensional tilt illusion

In the usual tilt illusion (TI) configuration, an inducing stimulus which has a single orientation is used psychophysically to explore orientation analysis in the human visual system. Recently, this approach has been extended to the use of inducing stimuli which have two orientations. Such a two-dimensional (2-D) stimulus permits investigation of the low-level analysis of visual patterns. Prior experimentation has left it unclear whether it is the spatial or the motion properties of a moving crossed-grating plaid which determine two-dimensional tilt illusions (2-D TIs) because these two parameters previously were perfectly correlated. In the present experiments pattern orientation and motion were decoupled. It is shown that 2-D TIs are determined by the spatial properties of an inducing annulus and not by its motion properties. The results also support the existence of a mechanism which extracts axes of symmetry, and which is difficult to account for in terms of local cross-orientation domain inhibition.     

Gender Differences in Cognitive and Emotional Adjustment to Traumatic Brain Injury

This study examined gender differences in cognitive and emotional status after traumatic brain injury (TBI) among 262 men and 140 women with TBI referred for neuropsychological evaluations. In this cross-sectional study, cognition was measured in terms of both absolute level of functioning (i.e., raw/standard scores) and estimated decline from premorbid levels expressed as z-deficit scores in the following domains: intelligence [Wechsler Adult Intelligence Scale—Revised (WAIS-R)], memory and attention [Wechsler Memory Scale—Revised (WMS-R)], processing speed (Trails A), and cognitive flexibility (Trails B). Emotional functioning was measured in terms of depression (Beck Depression Inventory) and general emotional distress (Brief Symptom Inventory). Kruskal–Wallis nonparametric one-way ANOVAs indicated that women and men differed significantly on 2 of 8 raw/standard cognitive scores [men demonstrated lower WMS-R General Memory (p < .05) and Trails B scores (p < .0001) and 4 of 8 relative decline scores [women demonstrated more estimated change in VIQ (Verbal IQ) [p < .0001], FSIQ (Full Scale IQ) [p < .01], and Attention (p < .01)]; men demonstrated greater estimated z-decline scores on Trails B (p < .01)]. Women reported significantly higher levels of depression (p < .01), but men endorsed significantly greater general psychological distress (p < .05). Research and assessment recommendations are suggested.     

Locke and Whately on the Argumentum ad Hominem

This is an exploration of what Locke and Whately said about the Argumentatum ad Hominem, especially in the context of what they said about the other ad arguments, and with a view to ascertaining whether what they said lends support to the understanding of this argument implicit in Johnstone's thesis that all valid philosophical arguments are ad hominem. It is concluded that this support is forthcoming insofar as Locke and Whately had in mind an argument concerned with principles.The essay ends with a brief reformulation of Johnstone's generalization regarding philosophical arguments.     

The Future of Psychology in Medical Specialities: Introduction to the Special Issue

The continuing evolution of the health care delivery system in the United States presents threats and opportunities to psychologists in medical settings. This special issue explores the future of psychology in psychiatry, family medicine, rehabilitation, geriatric medicine, and pediatric medicine. The challenges facing neuropsychology and pain management are explored also. Finally, the professional issues of ethics in managed care, psychology in the public sector, and training future psychologists are addressed. Each paper summarizes concerns and provides recommendations for clinical practice, research, and training.     

Stimulus Presentation Ratios And The Outcomes For Correct Responses In Signal-detection Procedures

Three pigeons were trained to discriminate between two line orientations (S₁ and S₂). A left-key peck was correct when S₁ was presented, and a right key-peck was correct when S₂ was presented. In all procedures, correct responses were occasionally reinforced with food paired with the presentation of the magazine light. Incorrect responses produced a blackout. Six detection procedures were used. In the first, the signal presentation ratio was varied across conditions and the reinforcer ratio was allowed to covary. In the second, the signal presentation ratio was held constant at 1:1 and the reinforcer ratio varied across conditions. In the third, the signal presentation ratio was varied across conditions and the reinforcer ratio was held constant at 1:1. In these three procedures, correct responses that were not scheduled for reinforcement were followed by blackout. The remaining three procedures repeated those described above with one procedural change: Nonreinforced but correct trials were followed by the presentation of the magazine light. Birds showed systematic preferences for the key associated with the stimulus presented or reinforced most often. There was no change in the birds' performance over changes in the feedback for nonreinforced but correct responses.     

Neurofeedback and the Brain

Neurofeedback is an emerging neuroscience-based clinical application, and understanding the underlying principles of neurofeedback allows the therapist to provide referrals or treatment, and provides clients with a framework for understanding the process. The brain's electrical patterns are a form of behavior, modifiable through “operant conditioning,” with the excessive brain frequencies reduced, and those with a deficit are increased. The learning curve for EEG has been described (Hardt, 1975).     

Neuropsychology,genetic liability,and psychotic symptoms in those at high risk of schizophrenia

Neuropsychological assessments were compared among individuals at enhanced genetic risk of schizophrenia (n = 157) and controls (n = 34). The relationship between cognitive impairments and the presence of psychotic symptoms and measures of genetic risk was explored in the high-risk subjects. Neuropsychological differences were identified in many areas of function and were not accounted for by the presence of psychotic symptoms. Genetic liability was not associated with neuropsychological performance or with psychotic symptoms, but exploratory analysis showed some tests were associated with both liability measures. These results suggest that what is inherited is not the disorder itself but a state of vulnerability manifested by neuropsychological impairment, occurring in many more individuals than are predicted to develop the disorder.     

Tyrannized Souls: Plato's Depiction of the ‘Tyrannical Man’

In book 9 of Plato's Republic, Socrates describes the nature and origins of the ‘tyrannical man’, whose soul is said to be ‘like’ a tyrannical city. In this paper, I examine the nature of the ‘government’ that exists within the tyrannical man's soul. I begin by demonstrating the inadequacy of three potentially attractive views sometimes found in the literature on Plato: the view that the tyrannical man's soul is ruled by his ‘lawless’ unnecessary appetites, the view that it is ruled by sexual desire, and the view that it is ruled by a lust for power. I then present my own account. On the view I defend, the tyrannical man's soul is to be understood as ruled by a single, persistent, powerful desire for bodily pleasure: as much as he can get, and however he can get it. Finally, I show how understanding the tyrannical man's soul in the way I recommend helps resolve some commonly expressed concerns about this part of the Republic. I suggest, on this basis, that Plato's procedure in constructing his catalogue of corrupt cities and souls in Republic 8 and 9 was more carefully thought out and systematic than has sometimes been supposed.     

The Impact of Cancer on Psychological and Social Outcomes

Cancer is now the biggest cause of mortality worldwide. Although the debilitating physical symptoms of cancer have long been known, the psychological and social impacts of cancer have become the subject of examination only relatively recently. The psychological outcomes that have been examined are primarily negative emotional variables, e.g., anxiety, but emerging research has focused on positive emotional variables, e.g., post‐traumatic growth, or cognitive outcomes. In this article, we provide a synthesis of reviews that have addressed the psychosocial impact of cancer. The framework for this synthesis is provided by a conceptualisation in which the presence of cancer impacts on psychosocial outcomes either directly or via mediating variables, including physical symptoms and treatment, and that this effect may be moderated by several variables, some characteristic of the person with cancer (demographic or personality‐related variables) and some characteristic of their environment (social support and medical variables). We also briefly examine the impact of cancer on the broader family unit following cancer diagnosis, treatment, survivorship and bereavement. We conclude that the heterogeneity of the cancer experience highlights the need for theoretically driven research and consistency in measurement approaches to determine mechanisms by which cancer exerts influence on psychosocial outcomes. This would allow development and delivery of targeted psychological interventions and a clearer delineation of the roles of the various parties, including clinical psychologists, family members and policymakers.