Binocular SF interaction maps showed various degrees of elongation across neurons. These maps are arranged in the descending order of EIsf. Value of EIsf is shown at the upper-right corner. A, Optimal SF was 0.36 cpd, and optimal orientation (OR) was 163° for the dominant eye. B, SF: 0.64 cpd, OR: 19°. C, SF: 0.30 OR: cpd, 96°. D, SF: 0.27 cpd, OR: 1°. E, SF: 0.38 cpd, OR: 103°. F, SF: 0.56 cpd, OR: 9°. Values were similar for the nondominant eye (data not shown). Cells for E and F were of simple type, whereas the remaining cells were complex.