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Philosophy The Exclusion Argument for physicalism maintains that since every physical effect has a sufficient physical cause, and cases of causal overdetermination (wherein a single effect has more than one sufficient cause) are rare, it follows that if minds cause physical effects as frequently as they seem to, then minds must themselves be physical in nature. I contend that the Exclusion Argument fails to justify the rejection of interactionist dualism (the view that the mind is non-physical but causes physical effects). In support of this contention, I argue that the multiple realizability of mental properties and the phenomenal and intentional features of mental events give us reason to believe that mental properties and their instances are non-physical. I also maintain (a) that depending on how overdetermination is defined, the thesis that causal overdetermination is rare is either dubious or else consistent with interactionist dualism and the claim that every physical effect has a sufficient physical cause, and (b) that the claim that every physical effect has a sufficient physical cause is not clearly supported by current science. The premises of the Exclusion Argument are therefore too weak to justify the view that minds must be physical in order to cause physical effects as frequently as they seem to. Temple University – Theses Advisors/Committee Members: Vision, Gerald;, Solomon, Miriam, Wolfsdorf, David, Aizawa, Kenneth;.