Table 1.

Results of the inferential tests used to analyze A and h parameter estimates derived from the exponential discounting function and nonreinforced responses during the terminal link.

Probability Discounting Results
Baseline
Parameter	DF	F	p
A	2, 107	4.824	.010
h	2, 107	24.017	< .001
Amphetamine
Parameter	DF	F	p
A	3, 145	4.556	.004
h	3, 145	5.650	.001
Methylphenidate
Parameter	DF	F	p
A	3, 145	0.704	.551
h	3, 145	3.006	.032
Methamphetamire
Parameter	DF	F	p
A	3, 137	9.315	< .001
h	3, 137	8.001	< .001
Nonreinforced Responses During Terminal Link Results
Amphetamine
Factor	DF	F	p
Dose	3, 133	0.202	.895
Trial Block	4, 133	4.184	.003
Dose × Trial Block	12, 133	1.0647	.395
Methylphenidate
Factor	DF	F	p
Dose	3, 133	6.210	< .001
Trial Block	4, 133	6.860	< .001
Dose × Trial Block	12, 133	0.893	.555
Methamphetamine
Factor	DF	F	p
Dose	3, 125	0.859	.465
Trial Block	4, 125	1.507	.204
Dose × Trial Block	12, 125	0.267	.993
Response Rate Results
Amphetamine
Factor	DF	F	P
Trial Component (TC)	1, 105	125.847	< .001
Dose (D)	3, 105	15.094	< .001
Reinforcer (R)	1, 105	2.413	.123
TC × D	3, 105	1.890	.136
TC × R	1, 105	0.349	.556
D × R	3, 105	0.647	.587
TC × D × R	3, 105	0.349	.790
Methylphenidate
Factor	DF	F	P
Trial Component (TC)	1, 105	186.123	< .001
Dose (D)	3, 105	4.349	.006
Reinforcer (R)	1, 105	17.599	< .001
TC × D	3, 105	0.528	.664
TC × R	1, 105	2.394	.125
D × R	3, 105	0.948	.420
TC × D × R	3, 105	0.396	.756
Methamphetamine
Factor	DF	F	P
Trial Component (TC)	1, 103	122.370	< .001
Dose (D)	3, 103	25.097	< .001
Reinforcer (R)	1, 103	2.695	.104
TC × D	3, 103	3.238	.025
TC × R	1, 103	0.062	.804
D × R	3, 103	1.559	.204
TC × D × R	3, 103	0.801	.496