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Panpsychists run the explanation in the other direction. Rather than trying to explain experiences in terms of brain states, they explain brain states in terms of experiences. According to panpsychism, all that really exists are forms of consciousness: simple forms of consciousness at the micro-level, more complex forms of consciousness in human and animal brains. The view is not that these forms of consciousness exist alongside physical properties, but rather that physical properties just are forms of consciousness. The micro-level properties studied by physics are very simple forms of consciousness; the complex brain states studied by neuroscience are complex forms of consciousness.How can we make sense of this idea? The properties studied by physics – mass, spin, charge, etc. – don’t seem to be forms of consciousness, and people studying physics are not aware that they’re learning about forms of consciousness. The central insight that has inspired the recent resurgence of interest in panpsychism is that physical science isn’t really in the business of telling us what physical properties are, only what they do. For example, physics tells us what electrical charge does – opposite charges attract, like charges repel – but not what it is. Neuroscience characterises brain states in terms of their chemical components, which chemistry characterises in terms of their physical components, which physics ultimately characterises in terms of behaviour. Taken as a whole, physical science gives us no clue as to what physical properties really are, which allows for the possibility that they might turn out to be forms of consciousness.
