Fig. 2.

Peak effects of ketamine and triazolam on working memory and episodic memory tasks. Working Memory tasks: Y-axes represent the number of trials correct or the median reaction time expressed as a percent of pre-drug responding. Episodic Memory task: Y represent the number of correct words recalled or the ability to discriminate (discriminative index, d′) between old and new words. X-axes represent dose in milligrams per kilogram (ketamine) or milligrams per 70 kg (triazolam) (log scale). PL designates placebo. Data points show means, brackets show ±1 SEM. Filled symbols indicate a significant difference from placebo. An asterisk indicates a statistically significant difference between a dose of triazolam and the corresponding (i.e., low or high) dose of ketamine