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Autonomic responses to unsignaled reward. (A) On 25% of trials, a large drop of water (0.5 mL) was delivered either during the fixation period or the ITI, with no prior indication. (B) Pupillary dilation as a function of time (percent change, mean ± SEM) for the control (Upper) and lesion (Lower) groups. Format as in Fig. 2A.
