Aim l ‐Theanine ( N ‐ethyl‐ l ‐glutamine) is an amino acid uniquely found in green tea. Growing evidence has suggested the possible effects of l ‐theanine on cognition. Previously, we found that l ‐theanine attenuates MK ‐801‐induced deficit in prepulse inhibition ( PPI ) in mice. In this study, …