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. Author manuscript; available in PMC: 2013 Jan 1.
Published in final edited form as: Behav Brain Res. 2011 Sep 8;226(1):340–344. doi: 10.1016/j.bbr.2011.09.003

Figure 1. Examples of variable and fixed ratio reinforcement conditions.

Figure 1

(A) Rats were trained to lever press for saccharin on either a fixed ratio (FR; n=6) or variable ratio (VR; n=5) schedule of reinforcement. Lever pressing for saccharin lasted for 55 days and rats from both groups worked reliably to achieve FR20 or VR20 reinforcement schedules. Over the course of the sessions, the average number of days worked on each ratio (B), lever presses made (C), and amount of saccharin reward obtained (D) was statistically the same for FR and VR animals.