Dependence of transition value of competitor response profile on S1 strength for Imc neurons. A, Definition of transition value of competitor response profile and competitor response profile bias for switch-like visual competitor response profile in Figure 1C (see Materials and Methods). S1 = 3.6°/s (black triangle); transition value = 5.9°/s; bias = 2.3°/s. B, Distribution of competitor response profile bias for visual competitor response profiles; n = 66 Imc neurons. Median = −0.52, p = 0.39; sign versus 0. C, Distributions of biases of competitor response profiles, separately for Imc neurons with switch-like competitor response profiles (top) and gradual competitor response profiles (bottom). Switch-like: median bias = −0.68, p = 0.52, sign test against 0 followed by Holm–Bonferroni correction for multiple comparisons, n = 39 neurons; gradual: median bias = −0.36, p = 0.7, sign test against 0 followed by Holm–Bonferroni correction for multiple comparisons, n = 27 neurons. D, Schematic of experimental protocol to measure two competitor response profiles with S1 stimuli of two different strengths, indicated by magenta and blue dots. S1 = 11.6°/s, magenta data; S1 = 17.6°/s, blue data. E, F, Two competitor response profiles (shown in magenta and blue, respectively) measured using protocol in D at an example neuron with switch-like competitor response profile. E, Rasters. F, Firing rate plots (conventions are as in Fig. 1). Transition values: 6.95°/s (when S1 = 11.6; magenta data) and 12.3°/s (when S1 = 17.6°/s; blue data). Shift ratio (shift in transition value/change in S1 strength) for this example neuron = 0.88. G–I, Schematic (G) and two competitor response profiles (H, I) measured at an example neuron with gradual competitor response profile. Transition values: 3.22°/s (when S1 = 7.6°/s; green data) and 9.01°/s (when S1 = 13.6°/s; orange data). Shift ratio for this example neuron = 0.96. J, Distribution of the shift ratio across n = 27 Imc neurons. Median shift ratio = 0.89, p = 0.26; sign test against 1.