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Lieving, L M; Odum, A L; Schaal, D W (2002) The effects of morphine on chained and clocked fixed-interval schedule performance in pigeons. Behav Pharmacol 13:221-8
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Ross, Linda; Schaal, David W (2002) Time of supplemental feeding alters the effects of cocaine on lever pressing of rats. J Exp Anal Behav 77:199-208
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Knealing, Todd W; Schaal, David W (2002) Disruption of temporally organized behavior by morphine. J Exp Anal Behav 77:157-69
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Schaal, D W; Odum, A L; Shahan, T A (2000) Pigeons may not remember the stimuli that reinforced their recent behavior. J Exp Anal Behav 73:125-39
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Odum, A L; Schaal, D W (2000) The effects of morphine on fixed-interval patterning and temporal discrimination. J Exp Anal Behav 74:229-43
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Odum, A L; Schaal, D W (1999) The effects of morphine on clocked fixed-interval performance: stimulus function or strength of stimulus control? Behav Pharmacol 10:243-55
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Odum, A L; Haworth, S C; Schaal, D W (1998) Food-deprivation level alters the effects of morphine on pigeons' key pecking. J Exp Anal Behav 69:295-310
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Schaal, D W (1996) Representing within-session response rates proportionally and entirely. J Exp Anal Behav 66:135-41
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Schaal, D W; McDonald, M P; Miller, M A et al. (1996) Discrimination of methadone and cocaine by pigeons without explicit discrimination training. J Exp Anal Behav 66:193-203
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Schaal, D W; Miller, M A; Odum, A L (1995) Cocaine's effects on food-reinforced pecking in pigeons depend on food-deprivation level. J Exp Anal Behav 64:61-73
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