Purchase this article with an account.
or
Journal of Vision. 2015; 15(2):23. https://doi.org/10.1167/15.2.23
Journal of Vision. 2012; 12(3):17. https://doi.org/10.1167/12.3.17
Journal of Vision. 2008; 8(1):20. https://doi.org/10.1167/8.1.20
This PDF is available to Subscribers Only