Purchase this article with an account.
or
Journal of Vision. 2010; 10(5):21. https://doi.org/10.1167/10.5.21
Journal of Vision. 2008; 8(7):14. https://doi.org/10.1167/8.7.14
Journal of Vision. 2008; 8(6):16. https://doi.org/10.1167/8.6.16
This PDF is available to Subscribers Only