Chromatic and luminance sensitivity for skin and skinlike textures.

Despite the importance of the appearance of human skin for theoretical and practical purposes, little is known about visual sensitivity to subtle skin-tone changes, and whether the human visual system is indeed optimized to discern skin-color changes that confer some evolutionary advantage. Here, we report discrimination thresholds in a three-dimensional chromatic-luminance color space for natural skin and skinlike textures, and compare these to thresholds for uniform stimuli of the same mean color. We find no evidence that discrimination performance is superior along evolutionarily relevant color directions. Instead, discriminability is primarily determined by the prevailing illumination, and discrimination ellipses are aligned with the daylight locus. More specifically, the area and orientation of discrimination ellipses are governed by the chromatic distance between the stimulus and the illumination. Since this is true for both uniform and textured stimuli, it is likely to be driven by adaptation to mean stimulus color. Natural skin texture itself does not confer any advantage for discrimination performance. Furthermore, we find that discrimination boundaries for skin, skinlike, and scrambled skin stimuli are consistently larger than those for uniform stimuli, suggesting a possible adaptation to higher order color statistics of skin. This is in line with findings by Hansen, Giesel, and Gegenfurtner (2008) for other natural stimuli (fruit and vegetables). Human observers are also more sensitive to skin-color changes under simulated daylight as opposed to fluorescent light. The reduced sensitivity is driven by a decline in sensitivity along the luminance axis, which is qualitatively consistent with predictions from a Von Kries adaptation model.

Caregivers' views on stigmatization and discrimination of people affected by leprosy in Ghana.

BACKGROUND: Leprosy is a condition that has long been associated with stigma and discrimination, even when infected persons have been cured. This paper describes stigma and discrimination as viewed by caregivers who are associated with people affected by leprosy in Ghana. METHODS: A qualitative interview with semi-structured interviews were conducted for twenty caregivers. RESULTS: Findings indicated that caregivers were of the view that people affected by leprosy in Ghana are stigmatized and discriminated against by the larger society thus making their movements and interactions restricted to the Leprosarium. Besides, employments opportunities are unavailable to them thus making them exposed to financial challenges. The livelihood Empowerment Against poverty (LEAP) money given them is not sufficient for their daily upkeep. CONCLUSION: People affected by leprosy in Ghana are stigmatized and therefore find it difficult to interact freely with the public. The associated physical deformities with the disease also tend to impede their ability to relate to the general public. The LEAP cash given to people affected by leprosy is helpful however, it could be enhanced to keep pace with prevailing economic conditions in the country.

Stigmatisation and discrimination: Experiences of people affected by leprosy in Southern Ghana.

Introduction: Leprosy, a chronic infectious disease, poses a serious public health concern due to its impact on the wellbeing of affected people. This study, which was set in Ghana, explored stigmatisation and discrimination experiences of people affected by leprosy resident at the Weija Leprosarium in Accra. Methodology: Using a qualitative research methodology, 26 participants were purposively selected and in-depth interviews conducted. The interviews were audio-recorded, transcribed, and categorised based on the objectives of the study. Findings: The findings revealed that participants experienced stigma and discrimination from their families, friends, healthcare providers and community members. Evidence showed that whereas some participants anticipated stigma and discrimination from prospective employers, others internalised the negative beliefs associated with the disease and gave up searching for jobs. Moreover, the findings indicated that participants were not willing to reintegrate into their communities since they considered the Leprosarium a safe haven. Conclusion: Based on the findings of the study, we conclude that people affected by leprosy included in this study experienced stigmatisation and discrimination. We therefore suggest that efforts aimed at reducing and in the long run curing the stigma of leprosy must be contextualised and scaled up. Also, implications are discussed for social work and public health practices.

Leprosy and stigma in the context of international migration.

If it can be argued that no single attribute or condition (leprosy included) is inherently or universally considered to be 'deeply discrediting,' to quote Goffman, then we must consider how external factors shape stigma associated with that condition in different cultural and socioeconomic contexts. Often, an analysis of what is perceived to be stigma towards people affected by leprosy uncovers other prejudices or stigmatising attitudes associated with class, gender, and/or ethnic inequalities in that society. The movement of people across international borders adds new dimensions to the experience of leprosy, as affected individuals confront different sets of understandings of the disease among healthcare professionals, friends, family, and employers in host and sending countries. Preconceptions of the immigrant 'other' in host countries may be bound up with notions of disease and danger, further complicating the experience of leprosy treatment for immigrants. Drawing on the work of others and on early stage qualitative research on leprosy among Brazilian immigrants to the United States, this paper will consider the ways in which immigration and transnational processes could affect the experience of stigma among immigrants affected by leprosy.

Report of the Stigma Research Workshop for the development of scientific consensus papers and field guidelines on health-related stigma, held in Amsterdam, the Netherlands from 11-14 october 2010.

Summary In concurrence with the broad body of literature published on health-related stigma, there is a need for practical field guidance to contribute to the fight against leprosy-related stigma and discrimination. To this end, much can be gained by considering the accumulated knowledge and learned from experience with different stigmatising conditions; primarily HIV/AIDS, disability, tuberculosis, and mental health. Therefore a Stigma Research Workshop was organised from 11-14 October in Amsterdam, The Netherlands. The primary aim of the workshop was to produce scientific papers and field guidelines that could be used to target actions against health-related stigma and discrimination. Keynote presentations were offered by scientists and professionals from different health domains who shared their knowledge, experiences and research findings regarding health-related stigma. Group work was subsequently conducted to work towards agreed outputs on four different themes: i.e. research priorities, measurement, interventions, and counselling. The spectrum of expertise present enabled an interdisciplinary and inter-profession sharing of knowledge and practices. This resulted in the commencement of consensus papers and field guidelines related to the four themes. An evaluation by participants concluded that the workshop had been an informative and worthwhile activity that will strengthen the fight against stigma.

The discrimination of chromatic textures.

Color discrimination is influenced by chromatic distributions such as they appear on differently illuminated 3D surfaces (T. Hansen, M. Giesel, & K. R. Gegenfurtner, 2008). Here, we measured discrimination thresholds for chromatically variegated stimuli and modeled the data employing a model with multiple chromatic mechanisms. Each mechanism has a differently tuned half-wave-rectified cosine-shaped sensitivity profile centered at a different chromatic direction. To estimate thresholds, the model's responses to a test and a comparison stimulus are determined. A detection variable is calculated by taking the difference of the responses to the two stimuli and by a subsequent nonlinear combination of the responses. The model was fitted to the data presented in T. Hansen et al. (2008) and to data from two new experiments. In the first experiment, we measured discrimination thresholds for stimuli chromatically variegated along a direction orthogonal to the one used in the previous experiments. In the second experiment, we investigated the interplay between chromatic distributions and different mean contrast levels. We found that a model with eight mechanisms accounted for the effect of chromatic variation within the stimuli and provided a better fit to the discrimination thresholds than a four mechanisms model.

Awareness about the persons with disability act among leprosy patients and other disabled persons.

To assess the level of awareness about the different provisions of the Persons with Disability Act (PWD Act) among leprosy patients and other disabled, 233 disabled persons from the self-help groups formed by Vadathorasalur Leprosy Control Unit have been interviewed using a structured interview checklist. The results show that 74.7% of the respondents were aware that identity cards are available for the disabled, 56.2% were aware of the free education benefit to the disabled, as low as 35.6% were aware of the scholarships, 33% knew about the employment reservations, 24.9% heard about the housing scheme of the government for the disabled, but 24.5% only knew about law against discrimination, 31.8% came in contact with institutions for the severely disabled and only 16% were aware of the unemployment allowance to the disabled. The level of awareness is low among women with regard to all components of the Act. It was found that students studying up to secondary level were not aware of the availability of scholarships and free education, which needs to be seriously looked into, especially by educational institutions. The level of formal education played a significant role in increasing awareness about the Act among literates. The knowledge is low among persons of all occupations. The study showed that there is a great need for an educational intervention programme to publicize the provisions of the Act among the disabled and their families.