Dualismen

Dualismen is the view that reality consists of two fundamental kinds of substances or aspects. In the philosophy of mind, it is most often understood as substance dualism: the mind and the body are two distinct kinds of substance—mental and physical. The mind is associated with thoughts, feelings, and intentional states, while the body is extended in space and governed by physical laws. The core claim is that mental phenomena cannot be fully reduced to physical processes.

The most influential form is Cartesian dualism, named after René Descartes. Descartes argued that mind and body interact yet are ontologically distinct. He described the mind as a thinking, non-extended substance and the body as an extended, non-thinking substance. The proposed site of interaction, the pineal gland, was later questioned as a satisfactory mechanism.

Beyond substance dualism, philosophers distinguish other dualist positions. Property dualism holds that there are two kinds of properties—mental and physical—in a single substance. Dual-aspect theories view mental and physical as two aspects of one underlying substance. Emergent or non-reductive physicalist positions describe how mental properties arise from physical substrates without positing a separate non-physical substance.

Critiques focus on the interaction problem: how can a non-physical mind causally affect a physical body? Developments in neuroscience and arguments for physicalism have made substance dualism controversial, though it remains a topic of ongoing debate. In broader contexts, dualism can also refer to the belief in two opposed principles, such as good and evil, within religious or metaphysical frameworks.