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. 2009 Mar;91(2):257–286. doi: 10.1901/jeab.2009.91-257

Fig. 5.

Fig. 5

Token-production response rates of 3 pigeons as a function of exchange-ratio size and schedule type: FR (open circles) and VR (closed circles) over the final five sessions of each condition. Unconnected points denote data from replicated conditions. Error bars indicate the range of values contributing to the means. From Foster, Hackenberg, & Vaidya (2001). Copyright, 2001 by the Society for the Experimental Analysis of Behavior, Inc. Reprinted with permission.