Table 1. Two-Factor Model.

	Factor1	Factor2
DRL: burst responses	0.717	−0.008
DRL: peak response latency	−0.678	−0.153
Go/No-Go: false alarm rate	0.571	0.145
Go/No-Go: hit rate	0.436	0.042
Open field activity	0.362	−0.064
Progressive ratio lever presses	0.858	−0.008
Delayed discounting slope	0.005	0.464
Probabilistic discounting slope	−0.001	1.003
Correlation of factors	1.000
	0.209	1.000

Significant factor loadings (absolute value >0.3) are bolded.