Table 1.

MSN firing rates in the parkinsonian state (Off state)

Separation by dopamine responses	Percentage of units a	Baseline rate (Hz)
Increased activity (D1)	64%	25 ± 1.3
Decreased activity (D2)	34%	33 ± 1.7*

All units were separated according to dopamine responses, as increased or decreased activity (n = 140).

^aThe proportion of neurons with each response was compared with the expected 50% each by χ ² test, p < 0.001.

*p < 0.001 (mean ± SEM); firing rates were compared between both groups of dopamine responses (unpaired t test).