An Empirical Explanation of the Cornsweet Effect

This work was supported by National Institutes of Health Grant NS29187. We are grateful to Tim Andrews, David Coppola, Don Katz, Tom Polger, Len White, and Mark Williams for helpful criticism, and to Rochelle Schwartz-Bloom for advice with statistical issues.

Correspondence should be addressed to Dale Purves, Box 3209, Duke University Medical Center, Durham, NC 27710.