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Antagonism by ritanserin (1 μmole/kg) of the enhancement of CR acquisition produced by LSD (0.030 μmole/kg). Ritanserin was injected subcutaneously 60 min prior and LSD intravenously 20 min prior to each acquisition session. Acquisition of the NM response was measured during the pairing of a tone CS and air puff US. Data are taken from Welsh et al. (1998a).
