Fig. 7.
The size tuning function depends on the orientation of the stimulus grating. A: divisive normalization model (DNM) complex cell with standard parameters. B: V1 complex cell (replotted from Tailby et al. 2007, Fig. 2b, anesthetized cat; error bars = ±SE). C: the stimulus and suppressive drive terms of the DNM equation. The grating orientation in the Opt condition matched the preferences of the respective neuron. The orientation in the OriΔ condition was determined by the half-height point of the orientation tuning function (Tailby et al. 2007). See text for details. All gratings had maximal contrast (c = 1), and their frequency matched the preference of the respective neuron. (See phenomenon 3 in Table 1.)