Dual-target search for high and low prevalence X-ray threat targets

Recent studies have shown that the prevalence of target presentation in visual search has an impact on target detection rates, and also that searching for two targets leads to a decrement in performance (the “dual-target cost”). In the present experiments, we added to previous work that has examined the interaction between the prevalence effect and dual-target cost, and also to previous work that has examined a full range of prevalence levels. We found no interaction between the dual-target cost and prevalence effect, though the response criterion in dual-target search did interact with target prevalence in an unexpected manner. Furthermore, we detected anasymmetry in the prevalence effect: It was more marked for high than low prevalence. Implications for real-world tasks are discussed.     

Does Particularism Solve the Moral Problem?

Abstract

Moral cognitivism, internalism about moral judgements, and Humeanism about motivating reasons all possess attractions.Yet they cannot all be true.This is the so–called moral problem. Dancy offers an interesting particularist response to the moral problem. However, we argue that this response, first, provides an inadequate basis for the distinction between motivating states and states necessary for motivation although not themselves motivators; second, draws no support from considerations about weakness of the will; and third, involves an implausible account of desire.We conclude that particularism ú whatever other attractions it may have ú does not solve the moral problem.     

Dual brain,creativity, and health

Abstract

The importance of the specialized functions of the right and left hemispheres is reviewed, with applications to education, treatment, creativity, and research duly noted. Experimental studies serve as indications of how alexithymia and creativity of the so‐called dual brain has been examined. Patients with com‐missurotomies, patients in psychotherapy, priests, creative subjects, and normal controls have been compared through a variety of experimental methods in terms of hemispheric specialization. The results indicate that creative and healthy subjects tend to have freer access to mutual interaction of both hemispheres without marked inhibitory or disinhibitory effects from either cerebral hemisphere.     

Pharmaceutical Ethics and Physician Liability in Side Effects

We review Side Effects, a 2013 film involving bioethics, pharmaceuticals, and financial conspiracies. After the main character Emily unsuccessfully attempts suicide, she begins receiving care from a psychiatrist, Dr. Banks. Following numerous events, she is placed on a fictional antidepressant, Ablixa, which leads her to suffer from sleepwalking. During an episode of sleepwalking she commits a serious crime. The film poses an interesting dilemma: How responsible would the physician be in this instance? We analyze this question by applying numerous ethical principles.     

Stage of physical activity and approach-avoidance achievement goals in university students

ObjectivesThe main purpose of the present investigation was to examine approach-avoidance achievement goal patterns across stages of physical activity participation. In addition, sex differences in the approach and avoidance goals were examined as well as goal contrast scores (i.e., approach minus avoidance) as secondary purposes.DesignThe research was cross-sectional in design.MethodParticipants were 804 university students who completed a questionnaire assessing their stage of physical activity, 2 × 2 achievement goals, and demographics.ResultsMANOVA results revealed hypothesized and significant (p < .001) physical activity stage differences in the mastery and performance approach goals as well as significant (p's < .05) gender differences in both performance goals. A significant (p < .01) gender by physical activity stage interaction emerged for the performance goals and surprisingly, was found mainly in the advanced exercise stages (i.e., action, maintenance, and long-term maintenance). Last, significant (p < .001) gender and physical activity stage main effects emerged for the achievement goal contrasts. Males endorsed both the mastery and performance contrasts more than females. Collapsed for both sexes, the contrast scores were greater in the physically active than the non-active stages.ConclusionsFindings suggested that interventions targeting physical activity in university students should emphasize approach goals relative to the avoidance goals. Particular attention should be paid to the performance goals in the maintenance and long-term maintenance stages as they appeared theoretically inconsistent for the female participants. Last, the split in the preparation stage (active, non-active) should be incorporated into future stage based investigations as the split demonstrated two meaningfully different subgroups.     

Using Corticomuscular and Intermuscular Coherence to Assess Cortical Contribution to Ankle Plantar Flexor Activity During Gait

The present study used coherence and directionality analyses to explore whether the motor cortex contributes to plantar flexor muscle activity during the stance phase and push-off phase during gait. Subjects walked on a treadmill, while EEG over the leg motorcortex area and EMG from the medial gastrocnemius and soleus muscles was recorded. Corticomuscular and intermuscular coherence were calculated from pair-wise recordings. Significant EEG–EMG and EMG–EMG coherence in the beta and gamma frequency bands was found throughout the stance phase with the largest coherence towards push-off. Analysis of directionality revealed that EEG activity preceded EMG activity throughout the stance phase until the time of push-off. These findings suggest that the motor cortex contributes to ankle plantar flexor muscle activity and forward propulsion during gait.     

Selected Rorschach Response Characteristics of Sex Offenders

The purpose of this study was to determine if there were significant differences in certain response characteristics of sex offenders and a random sample of non-sex offenders to Rorschach cards II, IV, VI, and VII. The Rorschach responses of both samples were compared in terms of rejections, form level, sexual locations, overt sexual responses, and reaction time. There were significant differences between the samples in number of rejections and reaction time. It was concluded that these measures were useful in differentiating between the two groups.     

Bearing Witness Through Medicine: An Exploratory Study of Attitudes to Service Among Australian Evangelical Christian Doctors

This study explores the attitudes of Australian evangelical Christian doctors to healing, suffering and good practice, using in-depth interviews. Doctors described an intellectualised faith, in which medical care was conceived in itself as a way of bearing witness. The alleviation of suffering, for these doctors, included supporting patients to rediscover purpose and meaning in their lives. There was diversity of opinion about evangelising, with many feeling that this was a contingent activity best conducted outside the consultation. This cohort of doctors, mostly non-denominational, had consciously engaged in work with the poor and marginalised as an expression of their faith.     

Knowledge as a thick concept: explaining why the Gettier problem arises

The Gettier problem has stymied epistemologists. But, whether or not this problem is resolvable, we still must face an important question: Why does the Gettier problem arise in the first place? So far, philosophers have seen it as either a problem peculiar to the concept of knowledge, or else an instance of a general problem about conceptual analysis. But I would like to steer a middle course. I argue that the Gettier problem arises because knowledge is a thick concept, and a Gettier-like problem is just what we should expect from attempts at analyzing a thick concept. Section 2 is devoted to establishing the controversial claim that knowledge is thick, and, in Sect. 3, I show that there is a general problem for analyzing thick concepts of which the Gettier problem is a special instance. I do not take a stand on whether the Gettier problem, or its general counterpart, is resolvable. My primary aim is to bring these problems into better focus.     

Grouping Effects on Spatial Attention in Visual Search

In visual search tasks, spatial attention selects the locations containing a target or a distractor with one of the target's features, implying that spatial attention is driven by target features (M.S. Kim & K. R. Cave, 1995). The authors measured the effects of location-based grouping processes in visual search. In searches for a color-shape combination (conjunction search), spatial probes indicated that a cluster of same-color or same-shape elements surrounding the target were grouped and selected together. However, in searches for a shape target (feature search), evidence for grouping by an irrelevant feature dimension was weaker or nonexistent. Grouping processes aided search for a visual target by selecting groups of locations that shared a common feature, although there was little or no grouping by an irrelevant feature when the target was defined by a unique salient feature.