- Received December 11, 1995.
- Revision received March 29, 1996.
- Accepted April 2, 1996.
This research was supported by a National Institutes of Health (NIH) postdoctoral research fellowship (IEQA455) to G.M.B., by a McDonnel-Pew cognitive neuroscience postdoctoral training grant to S.A.E., by an NIH National Center for Research Resources grant (P41 RR09784) to G.H.G., and by a National Institute of Mental Health grant (MH50228), a Stanford University Research Incentive Fund grant, and an Alfred P. Sloan Research Fellowship to D.J.H. We thank Brian Wandell for his insightful advice.
Correspondence should be addressed to Geoffrey M. Boynton, Department of Psychology, Stanford University, Jordan Hall, Building 420, Stanford, CA 94305.