Fig. 4.

Orientation tuning width varies with contrast for both pinwheel and domain neuron population when using optimally sized CRF stimuli but is contrast invariant when stimuli include the ECS. Scatter plots show the effects of contrast on HWHH. (a) For the CRF condition, tuning width is broader at HC ($x$-axis) for both domain (filled circles) and pinwheel (open circles) neurons. (b) For the CRF+ECS condition, there is little difference in HWHH at low ($y$-axis) and HC, as both pinwheel and domain cells are found relatively close to the unity line. Note that the neurons plotted here are a subset of the neurons plotted in Fig. 5, because not all cells were measured at HC and LC for the same stimulus size.