1. Neural Dynamics Research Group, Department of Ophthalmology and Visual Sciences, 828 W. 10th Avenue, Vancouver, British Columbia, Canada V5Z 1L8
2. Program Experimental Medicine, University of British Columbia, Vancouver, Canada V5Z 1L8
3. Program in Neurosciences, University of British Columbia, Vancouver, Canada V5Z 1L8
4. MIT Computer Science and Artificial Intelligence Laboratory, 32 Vassar Street, Cambridge, MA 02139, USA
5. Hudson, FL 34667, USA
6. Department of Communicative Disorders, University of Louisiana, Lafayette, LA 70504-3170, USA
7. Internal Medicine Group Practice, PhyNet Inc., 4002 Technology Center, Longview, TX 75605, USA