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. Author manuscript; available in PMC: 2013 Mar 5.
Published in final edited form as: Neurosci Lett. 2012 Jan 9;511(1):8–11. doi: 10.1016/j.neulet.2011.12.068

Figure 2.

Figure 2

Progressive ratio responding for sensory stimuli. A. Between-groups comparison: mice were tested for progressive ratio responding for the same stimulus type as for FR-1. B. Within-groups comparison: mice that responded for type 5 stimuli in FR-1 sessions were subsequently tested for PR responding for all 5 stimulus types. Bars represent mean ± SEM. *p<0.05, **p<0.01, ***p<0.001.