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CORRIGENDA

Corrigendum

Pages 2739–2749: Wielaard J, Sajda P. "Circuitry and the Classification of Simple and Complex Cells in V1" (doi:10.1152/jn.00346.2006; http://jn.physiology.org/cgi/content/full/96/5/2739). During final production of this article, low-resolution images were erroneously inserted. The proper images have been inserted into the online article, and the online article now deviates from the print copy with regard to these corrected figures. The corrected figures are presented here, with the respective text legends.

View larger version (28K): [in this window] [in a new window]   FIG. 1. Model architecture (partially reproduced from Wielaard and Sajda 2005). Left top: typical cluster of ON (blue circles) and OFF (red dots) magnocellular lateral geniculate nucleus (M-LGN) cells that feed into one cortical cell. Receptive field centers of LGN cells are organized on a square lattice (orange). Left bottom: some typical M-LGN axons in the model cortex. Points of the same color are cortical cells that connect to the same LGN axon. Right: schematic depiction of the cortical connections µ',µk',k in the model. Cell types (4) and the connections between them (16) are color coded: 0(E) is red; 1(E) is orange; 0(I) is cyan; and 1(I) is blue. Color of connection indicates that cell of the same color is presynaptic. Thickness of a connection approximately reflects its strength; open-ended connections refer to connections between the same cell type; LGN input is indicated in yellow.

View larger version (14K): [in this window] [in a new window]   FIG. 2. Cycle-averaged membrane potential and spike train for typical simple and complex cells in the model in response to a drifting grating. Responses are for 8 drift directions of the grating, covering a range of in orientation and include the preferred direction of the cell. Notice the roughly linear behavior of the simple cell and the distinctly nonlinear behavior of the complex cell. Response to a blank stimulus (zero contrast) is indicated by a dashed line.

View larger version (14K): [in this window] [in a new window]   FIG. 3. Distributions of response modulations in spike train S1/S0 (A) and membrane potential V1/V0 (B) for a drifting grating stimulus. Sample size is about 30,000 cells. Distributions for cells with (without) LGN input are shown in the bottom panels.

View larger version (7K): [in this window] [in a new window]   FIG. 4. Distributions of the mean membrane potential V0 (A), first harmonic V1 (B), and threshold Vt (C) for complex (solid) and simple (dashed) cells in the model, as defined by the S1/S0 criterion.

View larger version (16K): [in this window] [in a new window]   FIG. 5. Cycle-averaged membrane potential and spike train for a typical simple and complex cell in the model in response to a contrast reversal grating. Responses are for 8 spatial phases of the grating covering a range of . Grating orientation is the equivalent of the preferred orientation of the cell. Notice the strong phase sensitivity of the simple cell (consistent with linearity) and the phase insensitivity and frequency-doubling of the responses of the complex cell.

View larger version (17K): [in this window] [in a new window]   FIG. 6. Distributions of response modulations in spike train S2/S1 (A, C) and membrane potential V2/V1 (B, D) for a contrast reversal stimulus. In A and B the sample consists of 1,200 cells, with about an equal number of cells with (dashed) and without (dotted line) LGN input. In C and D the sample consists of 1,200 cells, with about an equal number of simple (dashed) and complex (dotted) cells.

View larger version (18K): [in this window] [in a new window]   FIG. 7. Examples of the organization of extracellular and intracellular ON and OFF subfields for a simple and a complex cell in the model. A: extracellular, complex cell. B: intracellular, complex cell. C: extracellular, simple cell. D: intracellular simple cell.

View larger version (20K): [in this window] [in a new window]   FIG. 8. Distributions of subfield correlation coefficient r for extracellular (A, C) and intracellular (B, D) ON and OFF subfields. Sample consists of 1,200 cells with about an equal number of cells with and without LGN input.

View larger version (23K): [in this window] [in a new window]   FIG. 9. A: averaged conductances in response to a drifting grating at the preferred orientation (left) and a blank stimulus (right). B: averaged conductances in response to a contrast reversal grating at the preferred phase (left) and at the orthogonal phase (right). C and D: conductances after the transformation = 2, k = 1; notice that the LGN conductance has vanished. E and F: membrane potential (black), Ohmic approximation (dashed line), and after the transformation = 2, k = 1 (green).

View larger version (18K): [in this window] [in a new window]   FIG. 10. A: original distribution of V2/V1 for the sample of N0 = 600 cells with LGN input (solid) and the Ohmic approximation (dashed). B: distribution of V2/V1 for a sample of 600 model cells without LGN input (solid) and for sample of the N0 = 600 cells in A (with LGN input) after the transformation k = 1 (dashed). C: original distribution of V2/V1 for the cells with and without LGN input in A and B (1,200) (black). Distribution after the transformation k = 0 for half of the cells in A and k = 1 for the other half (red). Distribution after the transformation with k drawn randomly (independently) from a uniform distribution on [0, 1] for the cells in A (blue).

View larger version (18K): [in this window] [in a new window]   FIG. 11. Distributions of the intracellular subfield correlation coefficient for binary and continuous circuitry. Original distribution for the sample consisting of the cells with and without LGN input of Fig. 10, A and B (black). Distribution for the sample of Fig. 10A, after the transformation k = 0 for half of the cells and k = 1 for the other half (red). Distribution for the sample of Fig. 10A, after the transformation with k drawn randomly (independently) from a uniform distribution on [0, 1] for each cell in this sample (blue).

View larger version (11K): [in this window] [in a new window]   FIG. 12. Distributions of the intracellular V1/V0 ratio for binary and continuous circuitry. A: original distribution of V1/V0 (drifting grating) for the cells with and without LGN input of Fig. 10, A and B (black). Distribution of V1/V0 for the sample of Fig. 10A, after the transformation k = 0 for half of the cells and k = 1 for the other half (red). Distribution of V1/V0 for the sample in Fig. 10A, after the transformation with k drawn randomly (independently) from a uniform distribution on [0, 1] for each cell (blue). B: like A, but on a linear scale.

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