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Retardant effect of MDL11,939, ritanserin, and mianserin on acquisition of NM response as a function of dose. Drugs were injected subcutaneously 1 h prior to each conditioning session. Conditioning used the pairing of a tone CS with an air puff US. Drug effects are expressed as the percentage of vehicle controls. Data are taken from Welsh et al. (1998b) and Romano et al. (2000).
