[1] SALK INST, SAN DIEGO, CA 92186 USA
[2] BROWN UNIV, CTR NEURAL SCI, PROVIDENCE, RI 02912 USA
[3] YALE UNIV, DEPT PSYCHOL, NEW HAVEN, CT 06520 USA
[4] NORTHWESTERN UNIV, SCH MED, DEPT CELL MOLEC & STRUCT BIOL, CHICAGO, IL 60611 USA
[5] WELLESLEY COLL, DEPT BIOL SCI, WELLESLEY, MA 02181 USA
[6] UNIV CALIF IRVINE, CTR NEUROBIOL LEARNING & MEMORY, IRVINE, CA 92717 USA
[7] UNIV ARIZONA, DEPT PSYCHOL, TUCSON, AZ 85724 USA
[8] NIMH, NEUROPSYCHOL LAB, BETHESDA, MD 20892 USA
[9] JOHNS HOPKINS UNIV, BALTIMORE, MD 21218 USA