Descartes founded the concept of mind-body dualism. Mind-body dualism is the idea that the mind and the body are strictly separate from each other. The mind and the body differ on two different levels: One, in meaning and two in entities. Descartes' theory is that the mind is the substance that is immaterial and that engages in diverse activities such as imagining or rational thinking. Mental events have a subjective quality to them (the way things seem to us). Cartesian dualists argue that the mental does not have extension in space and the material cannot think.
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