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Differential reinforcement of low-rate (DRL) performances in SHR/NCrl (n=10) and SHR/NHsd (n=10) male rats. Values are the mean ± s.e.m. and individual rat data points for the percentage of reinforced responses (response efficacy) and percentage of responses with IRTs < 2s (burst responding) averaged over the last 3 daily sessions at criteria for the DRL 5s wait time (panels a and b) and the DRL 30s wait time (panels c and d). *ps<0.05 comparing SHR/NCrl to SHR/NHsd.
