Table 2.

The number and baseline firing rates of neurons recorded during instrumental responding task (experiment 2)

Treatment	Session	mPFC		OFC
		n	Baseline (Hz)	n	Baseline (Hz)
Vehicle	Day 0	117	5.88 ± 0.33	96	6.30 ± 0.33
Amphetamine, 2 mg/kg	Day 1	104	6.21 ± 0.34	89	5.69 ± 0.32
Amphetamine, 2 mg/kg	Day 3	104	6.94 ± 0.33	90	6.21 ± 0.34
Amphetamine, 2 mg/kg	Day 5	112	6.51 ± 0.31	79	6.08 ± 0.36
Amphetamine, 2 mg/kg	Challenge	86	6.62 ± 0.37	65	5.45 ± 0.51

Although baseline firing rates during 10 min of instrumental responding were higher than spontaneous baseline rates recorded in experiment 1, there were no significant between-session difference in mPFC or OFC (one-way ANOVA, p > 0.05).