Dose-response effect of L-theanine on psychomotor speed, sustained attention, and inhibitory control: a double-blind, placebo-controlled, crossover study.
Tharaka Lagath DassanayakeDevasmitha WijesundaraChanaka N KahathuduwaVajira S WeerasinghePublished in: Nutritional neuroscience (2022)
Consistent with our hypothesis, these findings suggest that L-theanine significantly improves attention in simple visuomotor tasks, but not in more complex sustained attention tasks, or executive control tasks that require top-down inhibition of pre-active responses.