Powell, K R; Iuvone, P M; Holtzman, S G (2001) The role of dopamine in the locomotor stimulant effects and tolerance to these effects of caffeine. Pharmacol Biochem Behav 69:59-70
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Powell, K R; Holtzman, S G (2001) Parametric evaluation of the development of sensitization to the effects of morphine on locomotor activity. Drug Alcohol Depend 62:83-90
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Powell, K R; Holtzman, S G (2000) Modulation of the discriminative stimulus effects of d-amphetamine by mu and kappa opioids in squirrel monkeys. Pharmacol Biochem Behav 65:43-51
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Powell, K R; Koppelman, L F; Holtzman, S G (1999) Differential involvement of dopamine in mediating the discriminative stimulus effects of low and high doses of caffeine in rats. Behav Pharmacol 10:707-16
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Powell, K R; Holtzman, S G (1999) Differential antagonism of the rate-decreasing effects of kappa-opioid receptor agonists by naltrexone and norbinaltorphimine. Eur J Pharmacol 377:21-8
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Powell, K R; Holtzman, S G (1998) Lack of NMDA receptor involvement in caffeine-induced locomotor stimulation and tolerance in rats. Pharmacol Biochem Behav 59:433-8
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