Yannielli, P C.; Harrington, M E.
1 Department of Psychology and Neuroscience Program, Smith College, Northampton, MA 01063, USA
2 Corresponding Author: M. E. Harrington
Acknowledgements: This work was supported by NIH grant NS26496. We would like to acknowledge the technical assistance of Kimberly Wong, Carolyn Delk and Jennifer Morgan.
Received 15 February 2000; accepted 5 March 2000