Reaction time in the monetary incentive delay task after treatment with green tea (n = 24) or placebo (n = 22). Data are expressed as mean ± SEM. Differences between placebo and green tea were assessed using Student’s t test. **p < 0.01, compared with placebo.
Zhang et al. Nutrition Journal 2013 12:84 doi:10.1186/1475-2891-12-84