Erratum to: Neurotox Res DOI 10.1007/s12640-012-9335-6

The original publication of the article contained wrong data in Fig. 1; the correct graphs showing the mean number of responses in active and inactive levers for rats that acquired self-administration of cocaine and their yoked controls that received passive infusions of cocaine or saline are as follows:

Fig. 1
figure 1

The mean number (±SEM) of responses in active and inactive levers for rats that acquired self-administration of cocaine at a dose of 0.5 mg/kg/injection and their yoked controls that received passive infusions of cocaine or saline. *p < 0.001 versus inactive lever. N = 6–8 rats/group

The authors sincerely apologize for these errors.