1. Department of Biology, York University, Toronto, Ontario, Canada
2. Centre for Vision Research, York University, Toronto, Ontario, Canada
3. Department of Psychological & Brain Sciences, University of Delaware, Newark, Delaware, USA
4. Center for Biological & Brain Imaging, University of Delaware, Newark, Delaware, USA
5. keithas@udel.edu
6. Department of Psychology, York University, Toronto, Ontario, Canada
7. imalik@udel.edu