*A*–*C*, mean rate of two example neurons in response to drifting gratings, as a function of the spatial frequency (*A*), temporal frequency (*B*) or size (*C*) of that grating. One neuron is a pattern cell (grey open symbols and dashed lines); the other is a component cell (filled symbols and continuous lines). The lines show the best-fitting predictions of descriptive functions fitted to the data in each panel.*D*, distribution of characteristic spatial frequency for component cells (top panel), unclassified cells (middle panel) and pattern cells (bottom panel). This parameter indicates the spatial frequency resolution of each neuron. Arrows show the means of the distributions. Mean frequency is 1.3 cycles deg^{−1} (median 1.11, SD 0.85, *n* = 55) for component cells, 0.91 cycles deg^{−1} (median 0.68, SD 0.80, *n* = 46) for unclassified cells and 0.82 cycles deg^{−1} (median 0.66, SD 0.6, *n* = 48) for pattern cells.*E*, distribution of preferred temporal frequency. Conventions as in*D*. Mean frequency is 10.2 Hz (median 9.4, SD 4.8, *n* = 47) for component cells, 10.8 Hz (median 10.6, SD 5.3, *n* = 40) for unclassified cells and 11.62 Hz (median 10.2, SD 6.2, *n* = 43) for pattern cells.*F*, distribution of preferred grating size. Conventions as in*D*and*E*. Mean size was 14.8 deg (median 15.1, SD 8.2, *n* = 27) for component cells, 11.8 deg (median 10.2, SD 6.3, *n* = 30) for unclassified cells and 14.1 deg (median 12.5, SD 8.4, *n* = 24) for pattern cells.

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