Figure 6.

Comparison of CSFs for knock-out and control mice under photopic and scotopic conditions. A, Spatial CSFs for C57BL/6J mice (filled symbols and continuous curves) and for Gnat1^−/− mice (unfilled symbols) measured for three temporal frequencies under bright photopic conditions of 1.8 log cd m⁻². B, Temporal CSFs for C57BL/6J and Gnat1^−/− mice for three spatial frequencies. Gnat2^cpfl-3 mice did not respond under the photopic conditions (NR, red triangles). C, Temporal CSFs for Gnat2^cpfl-3 (red triangles) and their control ALR/LtJ albino mice (gray circles) measured under scotopic conditions (−4.5 log cd m-2). Gnat1^−/− mice did not respond (NR, white circles). Spatial frequency is 0.031 cycles/°. Red curve through the red triangles is calculated with Equation 2 using the following parameters: f_to = 0.4 Hz, f_so = 0.03 cycles/°, f_sp = 80°/s, and k = 23 Hz⁻¹. The black curve in C and all curves in A and B were calculated with the parameters in Table 1.