Placebo effect, safety performance measurement

Herberg (1993) reported a study that assessed the effects on safety of combining kava with ethanol. This was a double blind, placebo-controlled randomized trial of 40 healthy volunteers (ten males and ten females in each group), aged between 18 and 60 years (mean=4l years). The aim of the study was to test the adverse effects on seven safety-related performance variables when adult volunteers combine kava with acute intake of ethanol at a blood alcohol concentration of 0.05%. The battery of performance tests measured vigilance, coordination, reaction time, and concentration. One group received the kava extract WS 1490 alone, and the other group received the kava extract... 

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