Melinda Evrithiki Koelling Robert Shapley Michael Shelley Retinal and cortical nonlinearities combine to produce masking in V1 responses to plaids. 390-400 2008 25 Journal of Computational Neuroscience 2 http://dx.doi.org/10.1007/s10827-008-0086-6 db/journals/jcns/jcns25.html#KoellingSS08