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No effect of global 5-HT depletion when 5,7-DHT was infused after the initial visual discrimination training (Expt. 2). (a) Sessions required to reach criterion (85% correct) in each phase. (b) Count of trials up to and including the session in which criterion was reached. (c–e) Errors committed until criterion was reached: (c) total errors; (d) errors on standard (noncorrection) trials; (e) errors on correction trials.
