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Heyman, G.M. (1994, Nov 18). Misunderstood messengers.<\/a> Boston Globe.<\/p>\n Heyman, G.M. & Monaghan, M.M. (1994).\u00a0Reinforcer magnitude (sucrose concentration) and the matching law theory of response strength.<\/a>\u00a0Journal of the Experimental Analysis of Behavior, 61, 505-516.<\/p>\n Petry, N.M., & Heyman, G.M. (1994).\u00a0Effects of qualitatively different reinforcers on the parameters of the response strength equation.<\/a>\u00a0Journal of the Experimental Analysis of Behavior, 61, 97-106.<\/p>\n Belke, T., & Heyman, G.M. (1994).\u00a0Increasing and signaling background reinforcement.<\/a>Journal of the Experimental Analysis of Behavior, 61, 65-81.<\/p>\n Belke, T., & Heyman, G.M. (1994).\u00a0A matching law analysis of the reinforcing efficacy of wheel running in rats.<\/a>\u00a0Animal Learning & Behavior, 22, 267-274.<\/p>\n Heyman, G.M. (1993).\u00a0Ethanol regulated preference in rats.\u00a0<\/a>Psychopharmacology, 112, 259-269.<\/p>\n Heyman, G.M. (1993). Response requirement increases fail to decrease preference for alcohol beverage in rats. [Abstract]. Alcoholism: Clinical and Experimental Research, 17, 480.<\/p>\n Heyman, G.M. & Oldfather, C. (1992).\u00a0Elasticity of preference for ethanol in rats: An analysis of the reinforcing properties of ethanol<\/a>. Psychological Science, 3, 122-130<\/p>\n Heyman, G.M. (1992).\u00a0Methylphenidate increases reinforcement efficacy: Matching law and rate dependency analyses.<\/a>\u00a0Psychopharmacology, 109, 145-152.<\/p>\n