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Flowchart of physostigmine, scopolamine, and ondansetron infusions. Four sessions, each at least 48 h apart, were conducted over 10 days. In addition to the three infusions noted, a saline infusion was administered on a separate day. Session order was pseudorandomized to assure randomization and to avoid having the two cholinergic probes (physostigmine and scopolamine) administered in consecutive sessions.
