Figure 4.

Dependencies between orientation tuning and SF. A, Examples of three cells' tuning matrices and direction tuning curves at different SFs. Left, Matrices of the response evoked by each stimulus. Pixel intensity corresponds to the average ΔF/F over two frames after stimulus presentation and over five repetitions. Arrows on the right point to different SFs color coded according to the curves on the right. Right, Direction tuning curves fitted with a double Gaussian. B, Comparison of tuning parameters between the preferred SF of each cell and one lower SF. Shown are scatter plots of cells that had preferred SF ≥0.02 cpd (n = 83 cells). Each circle represents a cell and cross represents population average. Shown from left to right are the response amplitude (ΔF/F) to the preferred direction (Pref), the response amplitude to the orthogonal direction (Orth), OSI, HWHH, and the preferred orientation (for this analysis, we subtracted 180° from the preferred direction of cells that had preferred direction >180°). C, Comparison of tuning parameters between the preferred SF of each cell and one higher SF. Scatter plots of cells that had preferred SF of ≤0.04 cpd (n = 88 cells). Shown are the same parameters as in B. Black circles depict cells with a significant change in their response amplitude to any stimulus between the preferred SF and nonpreferred SF and gray circles depict cells with no significant change (p < 0.001, t test with Bonferroni multiple-comparisons correction).