Figure 2From: Effect of green tea on reward learning in healthy individuals: a randomized, double-blind, placebo-controlled pilot study 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.Back to article page