Figure 4: Organization of excitatory and suppressive features for two subpopulations of V2 neurons.

(a) Spatial phase difference between the nearest-neighbor excitatory Gabors shows a peak at 90°, which is consistent quadrature pairing and local position invariance. (b) The angular standard deviation of the excitatory Gabors for each neuron. The neurons separate into two classes: one with similar orientations ‘uniform’ and one with diverse orientations ‘nonuniform’. These neurons also have different dynamics, biphasic for class 1 and unimodal for class 2 (c) inset. The distribution of nearest-neighbour differences between excitatory and suppressive features for the ‘uniform’ (c) and ‘nonuniform’ (d) class. (inset, b,d) Examples of the Gabors fit to neurons from each class. Blue and red denote excitatory and suppressive features, respectively; opacity is proportional to the weight of the Gabor feature.