Fig. 4.
Effects of dose of fluoxetine on fixed-ratio 1 (FR-1) and fixed-ratio 2 (FR-2) escape performance. Drugs were administered 1 h prior to behavioral testing. Data are presented as a blocks of five escape trials and b the mean escape latency for all 25 FR-2 escape trials. Data represent means ± SEM. Asterisks p<0.05 relative to saline and 2.5 mg/kg fluoxetine groups. The number in each bar represents the number of animals included in that group