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)

central claim is that anti-love biomedical intervention can be justified without the “simultaneous consent” of recipients (where the simultaneous consent of a person S is understood as S’s consent at time t to an intervention at t) when it contributes to increased autonomy. We begin with an overview of earlier discussions of the ethics of anti-love biomedical intervention, focusing on the pioneering work of Earp and colleagues. We then present some cases in which paternalistic intervention may be effective. We will (...) then present an argument for the idea of anti-love biomedical intervention without simultaneous consent, based on an analogy between (biomedical intervention in) addiction and (biomedical intervention in) love. One premise of this argument is that love and addiction are importantly similar in that they can compromise the autonomous capacity for self-governing. The other premise of this argument is that biomedical intervention in addiction without simultaneous consent can be justified if the intervention is expected to restore the compromised capacity for self-governing. We will propose the “Ulysses contract”, a contract to enforce anti-love biomedical intervention when the recipient refuses it, as a possible measure of such paternalistic intervention and discuss its possible risks. (shrink)