“Objective concentration capacity [test time, S (+): 25.4 ± 15.2 s, R (−): 34.8 ± 18.4 s, racemic ketamine: 40.…] and retention in primary memory [test time, S (+): 4.6 ± 1.2 s, R (−): 4.2 ± 1.4 s, racemic ketamine : 4.0 ± 1.… after S (+)- than either … min.”