. Author manuscript; available in PMC: 2010 Mar 17.

Published in final edited form as: Behav Brain Res. 2008 Nov 27;198(2):298–305. doi: 10.1016/j.bbr.2008.11.033

Table 3.

Quantitative indices of performance on multiple FR schedules as a function of lesion severity.

Group	Model	a (resps)	δ (s)	λ (s⁻¹)
Control	No Change (w = .35)	228	0.45	0.29
Unilateral Severe	δ (w = .50)	268	0.39 → 0.57	0.33
Moderate	λ (w = .24)	194	0.38	0.30 → 0.17
	δ (w = .20)	213	0.37 → 0.46	0.25
Severe	δ (w = .53)	185	0.39 0.99	0.35

Note. The arrows indicate changes in parameter (Pre → Post); no arrows indicate that parameter estimates were constant across pre- and post-lesion conditions. Two models are shown for the Moderate lesion group, because their likelihood of being best is similar. The units of the parameters are given in parentheses; resps stands for number of responses.