Metacontrast is a visual illusion in which the visibility of a target stimulus is virtually lost when immediately followed by a nonoverlapping mask stimulus. For a colored target, metacontrast is color-selective, with target visibility markedly reduced when the mask and target are the same color, but only slightly reduced when the colors differ. This study investigated neural correlates of color-selective metacontrast for cone-opponent red and green stimuli in the human V1, V2, and V3 using functional magnetic resonance imaging. Neural activity (...) was suppressed when the target was rendered less visible by the same-colored mask, and the suppression was localized in the cortical region retinotopically representing the target, correlating with the perceptual topography of visibility/invisibility rather than the physical topography of the stimulus. Retinotopy-based group analysis found that activity suppression was statistically significant for V2 and V3 and that its localization to the target region was statistically significant for V2. These results suggest that retinotopic color representations in early visual areas, especially in V2, are closely linked to the visibility of color. (shrink)

An emotional deficit in individuals with psychopathy has been regarded as a potential factor in the disinhibition of selfish behaviors, which can be an impediment to a successful life in human society. However, recent studies in the field of economics have made clear that emotional function is associated with irrational decision-making. In the present study, to test whether psychopathy may have a positive aspect in a social setting, we examined the decision-making of college students with high and low tendencies for (...) psychopathy in the ultimatum game, which illustrates conflict between fairness and economic utility. We also investigated electrodermal responses to fair and unfair offers for each group. Compared to low psychopathic controls, individuals with a high tendency toward psychopathy more often choose economic utility by accepting unfair offers. Whereas controls more often exhibited an electrodermal response to unfair offers compared to fair offers, high psychopathic individuals did not show a similar difference between the types of offer. The results suggest that the affective deficit of psychopathy might be associated with insensitivity to unfairness and may contribute to a rational decision to accept unfair offers. Hence, psychopathy can be rational in some social situations. (shrink)

What is a disaster? This paper explores the different hermeneutic levels that need to be taken into consideration when approaching this question through the case of Japan. Instead of a view of disasters as spatiotemporal events, we approach disasters from the perspective of the milieu. First, based on the Japanese «dictionaries of disasters», the Japanese vocabulary of disaster is described. Second, this paper reviews briefly the Japanese interdisciplinary disaster-management tradition. To highlight the human-made aspect of disasters, the idea of fūdo (...) 風土 is introduced. This concept allows us to see disasters as a phenomenon of the milieu, which emerges from the co-constitutive relations between individuals, communities, and the local environment. The final part debates the narratives by some national and international political actors that link «Japanese identity and culture» to disaster management and sometimes include nationalist claims rooted in the essentialization of the «Japanese exception». Given the cruciality of sociocultural and political representations of disasters tied to identity politics, and the increasing frequency and intensity of disasters, a long-term, local people-focused and culturally sensitive perspective on disasters might be better adapted to the climate change era. (shrink)