Neurons as n (200 vs 200 neurons): KO - WT -0.022, Welch's t-test p = 0.0031 Mice as n (5 vs 5 mice, mean of each mouse's neurons): KO - WT -0.022 (95% CI -0.061 to 0.017), p = 0.22 Responsive on all 20 trials: 170 of 400 neurons (42.5%); their mean ΔF/F on the same trials 0.122; mean ΔF/F of all neurons 0.054 (true average 0.05) Selected on odd trials (103 neurons): mean ΔF/F on odd trials 0.143, on held-out even trials 0.131 Share of responsive neurons per mouse: WT 47.0%, KO 38.0%; mice as n, Welch's t-test p = 0.39