Pilot study for assessing the behaviors of patients with schizophrenia towards a virtual avatar.

This study examined whether a virtual avatar could be perceived as a real human by patients with mental disease, especially schizophrenia, as well as whether a virtual avatar could be applied to acquiring patients' behavior characteristics in a short conversation situation. The virtual avatar has been used for various applications which need to communicate with other person or to train or educate by showing humanlike behavior. Recently, many researches have shown that the virtual avatar technology has been enhanced and the avatar could be perceived like real human. A virtual avatar, standing in a virtual room, was designed for this study. Tasks to approach, initiate a talk, and answer to avatar's questions was assigned to the 11 patients with schizophrenia. As behavioral parameters in the virtual environment, the interpersonal distance and the verbal response time were acquired. In addition, the Positive and Negative Syndrome Scale (PANSS) for patients was administered in order to investigate the relationship between patients' symptomatic characteristics and behavior parameters. The interpersonal distance was negatively correlated with the negative syndrome scale, a subscale of PANSS, which is consistent with previous research reporting the relationship between interpersonal distance and a real person's image. The verbal response time, however, was not correlated with any other subscale of PANSS. After analyzing subitems of the negative syndrome of PANSS, two positive correlations were found: one was with blunted affect and the other was with poor rapport. We concluded that the virtual avatar could be perceived as a real human by schizophrenic patients and the avatar could draw the schizophrenic patients' behavior characteristics.     

Gender, Internet use, and sexual behavior orientation among young Nigerians.

This study examined the influence of gender and Internet use on the sexual behavior orientation of young adults in Nigeria. Using an ex-post-facto design, data were collected from a total of 231 participants. Results of the hierarchical regression model provided support for the influence of gender and Internet use on sexual behavior orientation among young Nigerians. Further, results also revealed an interaction effect; as the use of the Internet increased, male participants reported a greater extent of risky sexual behavior orientation than their female counterparts. The findings were explained in the context of the theoretical foundations of the study, while practical implications for combating youths' risky sexual behavior orientation were highlighted.     

Human and machine perception of biological motion

More than 30 years ago, Johansson was the first to show that humans are capable of recovering information about the identity and activity of animate creatures rapidly and reliably from very sparse visual inputs – the phenomenon of biological motion. He filmed human actors in a dark setting with just a few strategic points on the body marked by lights – so-called moving light displays (MLDs). Subjects viewing the MLDs reported a vivid impression of moving human forms, and were even able to tell the activity in which the perceived humans were engaged. Subsequently, the phenomenon has been widely studied and many attempts have been made to model and to understand it. Typical questions that arise are: How precisely is the sparse low-level information integrated over space and time to produce the global percept, and how important is world knowledge (e.g., about animal form, locomotion, gravity, etc.)? In an attempt to answer such questions, we have implemented a machine-perception model of biological motion. If the computational model can replicate human data then it might offer clues as to how humans achieve the task. In particular, if it can do so with no or minimal world knowledge then this knowledge cannot be essential to the perception of biological motion. To provide human data for training and against which to assess the model, an extensive psychophysical experiment was undertaken in which 93 subjects were shown 12 categories of MLDs (e.g., normal, walking backwards, inverted, random dots, etc.) and were asked to indicate the presence or absence of natural human motion. Machine perception models were then trained on normal sequences as positive data and random sequences as negative data. Two models were used: a k-nearest neighbour (k-NN) classifier as an exemplar of ‘lazy’ learning and a back-propagation neural network as an exemplar of ‘eager’ learning. We find that the k-NN classifier is better able to model the human data but it still fails to represent aspects of knowledge about body shape (especially how relative joint positions change under rotation) that appear to be important to human judgements.     

Line-bisectioning and obstacle avoidance: Evidence for separate strategies

Previous studies have frequently applied a combination of line-bisection tasks (in which participants indicate the middle of a line) and obstacle avoidance tasks (in which participants move their hand between two obstacles) with the aim of revealing perception–action dissociations in certain neurological disorders, such as visual form agnosia and optic ataxia. However, valid conclusions about the underlying processing pathways can only be drawn if participants apply the same strategy in both tasks (i.e. finding the middle between the obstacles). Yet, this assumption has never been tested directly. In this experiment, we investigated whether participants perform obstacle avoidance and line-bisectioning using similar strategies by manipulating the position of the obstacles and the start position of the hand relative to the obstacles. Our results indicate that the lateral hand position during obstacle avoidance does not only vary as a function of obstacle location but also strongly depends on the start position. Moreover, participants showed increased sensitivity to obstacle shifts occurring closer to the hand's start position. In contrast, during line-bisectioning the sensitivity to obstacles shifts was unaffected by the hand's start position. The findings suggest that during obstacle-avoidance the need to keep a safe distance from the obstacles is balanced with the requirement to minimise energetic demands. In contrast, the main intention during line-bisectioning is to move to the perceived midpoint as accurately as possible. The fact that very different constraints underlie trajectory planning in both tasks implies that caution has to be taken when interpreting differences in performance levels.     

The Evolving Landscape of Global Surgery: A Qualitative Study of North American Surgeons’ Perspectives on Faith-Based and Academic Initiatives

Journal of Religion and Health - Faith-based missions have played a large role in surgical care delivery in low- and middle-income countries (LMIC). As global surgery is now an academic discipline,...     

Human lumbar cord circuitries can be activated by extrinsic tonic input to generate locomotor-like activity

We have demonstrated that non-patterned electrical stimulation of the lumbar cord can induce stepping-like activity in the lower limbs of complete spinal cord injured individuals. This result suggested the existence of a human lumbar locomotor pattern generator, which can convert a tonic input to a rhythmic motor output. We have studied the human lumbar cord in isolation from supraspinal input but under extrinsic tonic input delivered by spinal cord stimulation. Large-diameter afferents within the posterior roots are directly depolarized by the electrical stimulation. These afferents project to motoneurons as well as to lumbar interneurons involved in the motor control of lower limbs. Stimulation at 25-50 Hz can elicit rhythmic alternating flexion/extension movements of the lower limbs in supine individuals. Reducing the tonic input frequency to 5-15 Hz initiates lower limb extension. Epidural stimulation applied during manually assisted treadmill stepping in complete spinal cord injured persons immediately increases the central state of excitability of lumbar cord networks and enhances stepping-like functional motor outputs. Sustained, non-patterned tonic input via the posterior roots can activate human lumbar cord networks. Pattern generating configurations of these multifunctional circuitries can be set-up depending on the stimulation parameters and particularly on the input frequency.     

Psychosocial risk factors at work as predictors of mobbing

This work analyses the way in which various psychosocial risk indicators may predict mobbing. A sample of 638 workers, 168 men and 470 women, from the fruit-and-vegetable sector was evaluated. An anonymous questionnaire was administered to all employees who were present on the evaluation days in the companies comprising the study. After analysing the data obtained with the mobbing questionnaire NAQ-RE (Sáez, García-Izquierdo, and Llor, 2003) and with the psychosocial risk factors evaluation method of the INSHT (Martín and Pérez, 1997), using canonical regression, we found that several psychosocial factors such as role definition, mental workload, interest in the workers, and supervision / participation predict two types of mobbing: personal mobbing and work-performance-related mobbing.     

Migrant mental health: a model for indicators of mental health and health care consumption.

OBJECTIVE: This study explores the relationship between mental health and health care consumption among migrants in the Netherlands. DESIGN: Samples of the Turkish (n = 648), Moroccan (n = 102), and Surinamese (n = 311) populations in Amsterdam were examined. The study tested a hypothesized model of risk factors for psychiatric morbidity, indicators of well-being, and indicators of health care consumption. The model was specified on the basis of information from earlier research on the sample and literature on the topic. The model was tested and refined using structural equation modeling. MAIN OUTCOME MEASURES: Psychiatric morbidity and well-being measures were assessed with the CIDI 1.1 and MOS-sf-36 subscales, respectively. Health care consumption was assessed by the question "Have you ever consulted one or more of these professionals or health care facilities with respect to mental health problems or problems related to alcohol or drugs usage?" RESULTS: The primary result of this study was the confirmation that health care consumption among migrants is predicted by need and predisposition factors, such as health condition and sociodemographic characteristics. In addition, mental health care consumption of migrants is predicted by acculturation characteristics. This result suggests an effect of cultural and migrant-specific factors in help-seeking behavior and barriers to mental health care facilities. CONCLUSIONS: Findings confirm the existence of migrant-specific mechanisms in health care consumption. Mental health care professionals should be aware of these. However, ignoring common ground for interventions unnecessarily creates distance between migrant groups and between migrant and indigenous Dutch groups.     

The intervening role of social worldviews in the relationship between the five‐factor model of personality and social attitudes

The present research investigates in a student (N = 183) and a voter sample (N = 276) whether the relationships between the Five‐Factor Model (FFM) personality dimensions and social attitudes (i.e. Right‐Wing Authoritarianism [RWA] and Social Dominance Orientation [SDO]) are mediated by social worldviews (i.e. dangerous and jungle worldviews). Two important results were obtained. First, the perception of the world as inherently dangerous and chaotic partially mediated the relationships of the personality dimensions Openness and Neuroticism and the social attitude RWA. Second, the jungle worldview completely mediated the relationships between Agreeableness and SDO, but considerable item overlap between the jungle worldview and SDO was also noted. It was further revealed that acquiescence response set and item overlap had an impact on social worldviews and attitudes, but that their relationships were hardly affected by these biases. The discussion focuses on the status of social worldviews to explain social attitudes. Copyright © 2006 John Wiley & Sons, Ltd.     

Enhanced perceived responsibility decreases metamemory but not memory accuracy in obsessive-compulsive disorder (OCD)

Mixed findings have been obtained in prior research with respect to the presence and severity of memory and metamemory deficits in obsessive-compulsive disorder (OCD). We tested the hypothesis that experimentally induced increments of subjective responsibility would lead to a disproportionately strong decline of memory confidence and enhanced response latencies in OCD while leaving memory accuracy unaffected. Twenty-eight OCD patients and 28 healthy controls were presented a computerized memory test framed with two different scenarios. In the neutral scenario, the participant was requested to imagine purchasing 15 items from a do-it-yourself store. In the recognition phase, the 15 needed items were presented along with 15 distractor items. The participant was asked to decide whether items were on his or her shopping list or not, graded by subjective confidence. In the responsibility scenario, the general experimental setup was analogous except that the participant now had to envision that he or she was a helper in a region recently struck by an earthquake, dispatched to provide 15 urgently needed goods from a nearby town. In line with prior work by our group, samples did not differ in either condition on memory accuracy in a subsequent recognition task. As hypothesized, OCD participants were less certain in their responses for the high responsibility condition than controls. Whereas patients and controls did not differ in their subjective estimates for memorized items, patients expressed stronger doubt that their earthquake mission was successful. The findings indicate that low memory confidence in OCD may only be elicited in situations where perceived responsibility is high and that patients may share higher performance standards ("good is not good enough") than controls when perceived responsibility is inflated.