Frank Jackson’s "Knowledge Argument" introduced the philosophical world to Mary the brilliant neuroscientist, who knows everything there is to know about the physical world while living in a completely black and white environment. Yet she seems to learn something new when she leaves the room for the first time and sees and smells a red rose. So is physicalism – the claim that everything, including conscious experience, is physical – false?
In The Matter of Consciousness: From the Knowledge Argument to Russellian Monism (Oxford University Press 2023), Torin Alter argues that the argument is sound, comprehensively dealing with all the major types of objections raised against each of the premises. But Alter, who is professor of philosophy at the University of Alabama, also argues to a disjunctive conclusion: either standard physicalism is false, or (his own preference) it leads to Russellian monism – a non-standard physicalist view that posits intrinisic properties that both constitute conscious experience and underlie the basic physical properties. His book is an enjoyable, clearly written tour of one of the major philosophical debates on consciousness.
Carrie Figdor is professor of philosophy at the University of Iowa.
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