Purchase this article with an account.
or
Journal of Vision. 2013; 13(9):37. https://doi.org/10.1167/13.9.37
Journal of Vision. 2009; 9(3):29. https://doi.org/10.1167/9.3.29
Journal of Vision. 2008; 8(6):1160. https://doi.org/10.1167/8.6.1160
This PDF is available to Subscribers Only