Visual Neuroscience

Brief Communication

Reply to Philipona and O'Regan


a1 Department of Logic and Philosophy of Science, University of California, Irvine, California

a2 Department of Philosophy, California State University, Long Beach, California


This paper responds to Philipona and O'Regan (2006), which attempts to account for certain color phenomena by appeal to singularities in the space of “accessible information” in the light striking the retina. Three points are discussed. First, it is unclear what the empirical significance/import is of the mathematical analysis of the data regarding the accessible information in the light. Second, the singularity index employed in the study is both mathematically and empirically faulty. Third, the connection drawn between their findings and some data from the World Color Survey is lacking in quantitative analysis in places where it is needed. The difficulties raised prevent Philipona & O'Regan's conclusions from being accepted.

(Received September 09 2007)

(Accepted February 07 2008)


c1 Address correspondence and reprint requests to: Wayne Wright, Department of Philosophy, California State University, Long Beach, Long Beach, CA 90840. E-mail: