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Antireductionism is the position in science and metaphysics that stands in contrast to reductionism (anti-holism) by advocating that not all properties of a system can be explained in terms of its constituent parts and their interactions.
Although breaking complex phenomena into parts is a key method in science, there are those complex phenomena (e.g. in physics, psychology, sociology, ecology) where the approach does not work. Antireductionism also arises in academic fields such as history, economics, anthropology, medicine, and biology as attempts to explain complex phenomena using reductionist models do not provide satisfactory insight.
Karl Popper was a famous proponent of antireductionism. In his essay Of clouds and clocks, Popper classified phenomena into two types: "clock" phenomena with a mechanical basis and "cloud" phenomena which are indivisible and depend upon emergence for explanation.
For example, Popper thought that a materialist explanation of consciousness is not possible. The view of Reductionism about consciousness is explained by Max Velmans:
Velmans himself is not in agreement with this reductionist stance. Opposition to this mind = brain reductionism is found in many authors. An often mentioned issue is that science cannot explain the hard problem of consciousness, the subjective feelings called qualia. Another objection, whose explicit formulation is due to the physicist and philosopher Thomas Kuhn, is that science is not a self-contained entity, because the theories it uses are creations of the human mind, not inevitable results of experiment and observation, and the criteria for adoption of a particular theory are not definitive in selecting between alternatives, but require subjective input. Even the claim that science is based upon testability of its theories has been met with qualifications.
According to Alexander Rosenberg and David Kaplan, the conflict between physicalism and antireductionism can be resolved, that "both reductionists and antireductionists accept that given our cognitive interests and limitations, non-molecular explanations may not be improved, corrected or grounded in molecular ones". However, others find that the conflict between reductionism and antireductionism is "one of the central problems in the philosophy of psychology...an updated version of the old mind-body problem: how levels of theories in the behavioral and brain sciences relate to one another. Many contemporary philosophers of mind believe that cognitive-psychological theories are not reducible to neurological theories...most nonreductive prefer the idea of a one-way dependence of the mental on the physical."
Most reductionists accept that consciousness seems to be different from brain states (or functions) but claim that science will discover it to be nothing more than a state or function of the brain. In short, they mostly accept that brains states and conscious states are conceivably different, but deny that they are actually different (in the universe we happen to inhabit)Max Velmans; Understanding consciousness, Note 26, page 262.
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