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. Author manuscript; available in PMC: 2017 Feb 1.
Published in final edited form as: Behav Neurosci. 2015 Dec 14;130(1):50–61. doi: 10.1037/bne0000111

Figure 5. Instrumental responding for food reward in males and females.

Figure 5

(A) Rats were tested under a series of fixed ratio (FR) schedules of lever pressing for food (FR1, FR3, FR10 and FR20). Males lever pressed significantly more than females on each FR schedule. (B) In females, responding across the FR schedules did not differ across phases of the estrous cycle. Data are represented as the mean ± SEM number of lever presses at each FR schedule.