Vattimo’s Renunciation of Violence

For Gianni Vattimo, the renunciation of violence is the starting point for constructing a post foundational politics. So far, criticism of Vattimo’s argument has focused on his larger commitment to metaphysical nihilism and whether the renunciation of violence is a thicker principle than his post foundational philosophy can support. I argue that Vattimo’s renunciation of violence can also be criticized for two other reasons. First, Vattimo attempts to distinguish between acceptable and unacceptable uses of violence through an under developed idea of self-defense. Second, despite his attention to the political and philosophical impact of mass communications technology, Vattimo ignores emerging technological challenges to our understanding of violence. Nonetheless, I argue that Vattimo’s renunciation can still serve as a useful starting point for contemporary political thinking. What Vattimo’s logic shows is that we can enhance the moral standing of democracy by decisively detaching its practices and institutions from historical artifacts of political violence.     

Direction repulsion in unfiltered and ring-filtered Julesz textures

Perceived directions of motion were measured for each of two superposed two-dimensional dynamic random patterns consisting of unfiltered or ring-filtered dense random-check (Julesz) textures. One pattern always moved in a cardinal direction (up, down, left, or right), and the other texture always moved in an oblique direction separated from the cardinal component by 20 degrees-80 degrees. Several cardinal/oblique speed ratios were tested. In Experiment 1, the textures were unfiltered. In Experiment 2, the textures were ring filtered and had the same center frequency (1, 2, or 4 cpd). In Experiment 3, a 1-cpd ring-filtered texture was paired with a 2-, 4-, or 8-cpd texture. Subjects consistently misperceived the directions of component motion in these experiments; the angular separation of movement of the two textures was perceptually exaggerated, a phenomenon referred to as direction repulsion (Marshak & Sekuler, 1979). The results show that (1) direction repulsion occurs across at least a fourfold range of spatial frequencies and a sixfold range of speed ratios, (2) direction repulsion varies systematically with speed ratio, and (3) across most conditions, direction repulsion is anisotropic--direction repulsion is more evident in the oblique directions than in the cardinal directions. These findings suggest that the spatiotemporal range of inhibitory interactions involved in motion transparency is much greater than previously appreciated.