Species-specific wiring of cortical circuits for small-world networks in the primary visual cortex
Fig 2
Integration of global information by LRCs in a large network.
(A). Design of a visual stimulus containing “global” information in the form of positions of dots. (B). A simplified three-layer network model of the early visual pathway. (C). Two distinct sizes of the model network used in the simulations. (D). LRC ratio, i.e., the number of LRCs relative to the total number of connections, varying from 0% to 100%, while the total number of connections remains constant. The connection length in the simulation was sampled from observed statistics in biological data [5]. (E)-(F). The classification accuracy for the “position” dataset under variations of the LRC ratio in large and small networks. Thin lines indicate the results for different conditions of the center-dot distance in the stimulus (See S2A Fig for details). Bold lines indicate performance averaged over all stimulus conditions. (G)-(H). Visualization of the connectivity projection from the processing layer to a single readout unit in a large and a small network. The gray level of each pixel represents the number of connections linked to a readout neuron, and the total grayscale area indicates the effective “recognition” range of the readout. (I)-(J). Illustration of the average path length L of the network. Note that a wide effective range of lateral connections, leading to a small L, is necessary to identify global positional information in the visual stimulus. (K). Similarity between the modulation of the value of 1/L and of the classification accuracy of the network during the rewiring process when varying the LRC ratio. (L). A strong correlation is observed between 1/L and the classification accuracy of the network regardless of the network size and/or the stimulus condition. For each value of 1/L on the x axis, transparent dots indicate the results for different conditions of the center-dot distance in the stimulus and bold dots indicate the result averaged over all stimulus conditions. Error bars represent the confidence interval for 20 trials.