Figure 4
From: Statistical model of natural stimuli predicts edge-like pooling of spatial frequency channels in V2
Basis vectors of Experiment 2. A random selection of higher-order basis vectors a i estimated from natural images in Experiment 2. ICA nonlinearity g was the tanh nonlinearity g 1. Each display of three patches gives the coefficients of one higher-order feature. Each patch gives the coefficients of one higher-order feature in one frequency band. Each ellipse means that the complex cell in the corresponding location, and of the corresponding orientation and frequency is present in the higher-order feature, brightness of ellipse is proportional to coefficient a ki