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. Author manuscript; available in PMC: 2016 May 1.
Published in final edited form as: Behav Processes. 2015 Mar 17;114:41–51. doi: 10.1016/j.beproc.2015.03.007

Figure 4.

Figure 4

A “low-rate challenge” indicated perseveration of a high-rate pattern of lever-pressing. Rats were trained under a percentile that reinforced short interresponse times (IRTS) and, therefore, high response rates. At “session 0,” long IRTs were reinforced instead and at Session short ones were again reinforced. The solid, curved line shows logistic fits to the data. The median IRT lengthened for all groups but faster and with a greater magnitude for unexposed rats. The bottom panel shows that exposed rats persisted in producing high-rate response bouts while unexposed rats’ bouts were shorter.gr4