Response of the SFA units as a function of orientation of sinusoidal gratings.

<p><b>A</b> SFA unit response as a function of orientation. Solid red (dashed blue) lines indicate excitatory (inhibitory) response. <b>B</b> Orientation tuning functions of V1 cells of macaque monkey (figure adapted from DeValois et al. (1982) <a href="http://www.ploscompbiol.org/article/info:doi/10.1371/journal.pcbi.1003564#pcbi.1003564-DeValois1" target="_blank">[55]</a>). Note that inhibitory effects were not investigated by DeValois et al. <a href="http://www.ploscompbiol.org/article/info:doi/10.1371/journal.pcbi.1003564#pcbi.1003564-DeValois1" target="_blank">[55]</a>, and thus there are no inhibitory responses plotted in <b>B</b>.</p>