Working memory performance.

Accuracy (A) and reaction time (B) in the computerized n-back working memory task (2-back version) 2 h after administration of endotoxin (black bars) or saline (white bars) within the same individuals, respectively. The low-dose group receiving 0.4 ng E. coli endotoxin per kg of body weight is represented on the left, and the high-dose group receiving 0.8 ng/kg on the right. The maximum possible accuracy score in (A) was 25. Data are presented as means ± SEM. Significant differences between experimental condition and respective saline control: **p<0.01 (Bonferroni post hoc test).