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A convergence model for V2 RFs. (A) The model for V2 cells with ultralong RF subunits. Red and blue ellipse, on and off subregions. An ultralong cell may receive convergent projections from multiple V1 cells aligned along their preferred orientation. (B) The model for V2 cells with complex-shaped RF subunits. The cells may receive convergent inputs from V1 cells with different orientations at same or different center locations.
