Effects of ginger and expectations on symptoms of nausea in a balanced placebo design.

Gastric Activity Repeated measures ANOVA of the ratio between normal and tachygastric activity did not show effects of ginger or information or their interaction (F(3,144) = 0.644, p = .588) but there was a significant decrease of the ratio over the 4 periods (F(3,144) = 8.207, p<.001) and a trend towards significance of ginger (F(3,144) = 2.156, p = .096) illustrated in an interruption of the decrease at post-drug2 as seen in the placebo condition ( Figure 3 ).

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Post-hoc analyses of experimenter effects revealed a highly significant interaction with drug, information, and participant’s sex for behavioral measures in men only.

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