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Reverse correlation functions (kernels) for the two models. (A) Kernel for the PR model. (B) Kernel for the SE model. Both kernels are extracted from stimuli presented at 50 Hz. C and D are cross-sections taken from A and B at different orientations, respectively. Zero-crossings (the time at which the value of the kernel is zero) vary with orientation for the PR model but are constant in the SE model.
