almost significantlyP = .0619
In contrast, while the systemic administration of PD 128,907 (10 μg/kg, i.v.) completely suppressed the bursting activity of DA neurons (data not shown), only L741,626 significantly reduced the suppressant effect of PD 128,907 on bursting activity in these cells in the VTA (bursting remaining of 25.8 ± 13.1%, P < .01) and almost significantly in the SNc (bursting remaining of 21.2 ± 14.6%, P = .0619).