TABLE 4.

I_H properties of OB DA neurons.

	Top	Bottom	Large	Small
Voltage sag ratio (−25 pA)	0.05 ± 0.01	0.07 ± 0.02	0.03 ± 0.01	0.10 ± 0.05**
Voltage sag ratio (all)	0.06 ± 0.02	0.07 ± 0.02	0.04 ± 0.01	0.12 ± 0.03**
Vi positive to −120 mV	0.03 ± 0.2×10−2	0.03 ± 0.3×10−2	0.03 ± 0.3×10−2	0.10 ± 0.02****
Vi negative to −120 mV	0.07 ± 0.8×10−2	0.09 ± 0.01	0.06 ± 0.8×10−2	0.10 ± 0.02*

All data presented as mean ± SEM. There were no significant differences between Top and Bottom DA neurons, but there were several significant differences between Large and Small DA neurons. *p < 0.05; **p < 0.01; ****p < 0.0001.