Don't take six layers of cerebral cortex too seriously. Layer IV is
usually subdivided into IVa, IVb, and IVc and they have quite different
functions (see Jenny Lund's review in Ann. Rev. Neuroscience about 1988).
William H. Calvin WCalvin at U.Washington.edu
University of Washington NJ-15
Seattle, Washington 98195 FAX:1-206-720-1989
