Table 1.

Nucleus accumbens cell types observed during progressive ratio

	LPE cells	LPI cells	Other	Total
Number	32	10	55	97
%	33%	10%	57%	100%

		LPE cells	Animals
SCH23390	Saline controls	15	5
	10 μg/kg	12	4
	20 μg/kg	11	5
	30–50 μg/kg	13	5
Eticlopride	Saline controls	19	4
	10 μg/kg	14	4
	20 μg/kg	18	4
	40 μg/kg	12	3