Water deprivation as internal cue strengthens the expression of a weak memory. All graphs show percent of freezing time, expressed as mean ± SEM. The experimental design is shown at the top of each panel. (A) Water-deprived group in a weak CFC training shows an increase of memory expression during test 2 (n = 9 per group). (B) No effect of water deprivation is verified when test sessions are performed in a novel context (control group n = 7, water deprivation n = 8). Groups marked with the same letter (e.g., “a”) are statistically equal to each other and different from those marked with different letters (e.g., “a” groups differ from “b” groups), with significance level of P < 0.05.
