Figure 7: Connectivity matrices in the hierarchical recurrent circuit model.

a, The V1 encoding matrix (W_zx), each row represents the tuning curve of a V1 neuron. b, The recurrent connectivity matrix for V1 (W₁₁). The V2 recurrent connectivity matrix W₂₂ has a similar structure. c, The Feedback connectivity matrix from V2 to V1 (W₁₂). The corresponding feedforward matrix from V1 to V2, (W₂₁), is its transpose. Since W₂₁ is symmetric, the feedforward and feedback matrices are identical (W₁₂ = W₂₁).