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. Author manuscript; available in PMC: 2010 May 1.
Published in final edited form as: Neurotoxicol Teratol. 2009 Jan 21;31(3):149–158. doi: 10.1016/j.ntt.2008.12.006

Fig. 3.

Fig. 3

Proportion of responses falling within each inter-response time (IRT) bin during block 6 (steady-state performance). Only responses in the last two IRT bins resulted in the delivery of a reinforcer.