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Mean response rates under the multiple FR schedule during the last 10 sessions of baseline and post-lesion. The mean response rates are represented as solid circles for measures recorded before 6-OHDA lesion (Pre) and by open circles for measures recorded after the lesion (Post). The curves were drawn by Equation 1, using parameters from Table 2; for the Moderate group, parameters correspond to the model that assumes a change in minimum response duration, δ.
