Table 2.

Effect of d-amphetamine on quantitative timing parameters and overall response rate (mean ± SEM)

Parameter	Sham lesion		5,7-DHT lesion
	Vehicle	d-Amphetamine	Vehicle	d-Amphetamine
Indifference point, T50 (s)	15.9 ± 1.9	11.4 ± 1.3*	14.8 ± 1.2	13.8 ± 1.5
Slope, ɛ	−5.0 ± 0.6	−4.0 ± 0.4	−4.7 ± 0.6	−3.6 ± 0.7
Weber fraction	0.28 ± 0.05	0.34 ± 0.06	0.28 ± 0.04	0.46 ± 0.09
p2	0.97 ± 0.01	0.94 ± 0.04	0.98 ± 0.01	0.94 ± 0.02
Overall response rate (responses min−1)	47.3 ± 6.8	32.5 ± 7.3*	47.0 ± 5.5	27.8 ± 4.7*

*P < 0.05, significant difference from vehicle-alone condition