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Effect of reward rate on behavioral threshold. A, Reward rate fluctuates over the course of a typical behavioral session. B, Behavioral threshold increases with reward rate over the past 10 trials. Error bars from 11 points have been removed because they are larger than the height of the plot (these points are at the highest and lowest reward rates, which are the rarest and have the fewest samples). The regression remains significant upon removal of these points (p < 0.001).
