A dynamic, embodied paradigm to investigate the role of serotonin in decision-making.

Although we did not look at the ratio of plasma tryptophan to other large neutral amino acids, the differences between total blood plasma tryptophan levels with (5–8 μmol/L) and without (51–182 μmol/L) ATD were highly significant ( p < 0.0005, Wilcoxon rank-sum test).

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