In philosophy of mind, Cartesian materialism is the idea that at some place (or places) in the brain, there is some set of information that directly corresponds to our conscious experience. Contrary to its name, Cartesian materialism is not a view that was held by or formulated by René Descartes, who subscribed rather to a form of substance dualism.
In its simplest version, Cartesian materialism might predict, for example, that there is a specific place in the brain which would store a coherent representation of everything we are consciously experiencing in a given moment: what we're seeing, what we're hearing, what we're smelling, and indeed, everything that we are consciously aware of. In essence, Cartesian materialism claims that, somewhere in our brain, there is a place (or set of places) where a hypothetical outside observer could 'look in' and essentially 'see' the content of conscious experience moment by moment. In contrast, anything occurring outside of this "privileged neural media" is nonconscious.
Read more about Cartesian Materialism: Dennett's Arguments Against Cartesian Materialism
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“The form of act or thought mattered nothing. The hymns of David, the plays of Shakespeare, the metaphysics of Descartes, the crimes of Borgia, the virtues of Antonine, the atheism of yesterday and the materialism of to-day, were all emanation of divine thought, doing their appointed work. It was the duty of the church to deal with them all, not as though they existed through a power hostile to the deity, but as instruments of the deity to work out his unrevealed ends.”
—Henry Brooks Adams (1838–1918)