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Opening a new era in science, psychologys cognitive rev-olution contradicts traditional doctrine that science has no use for consciousness to explain brain function. Sub-jective mental states as emergent interactive properties of brain activity become irreducible and indispensable for explaining conscious behavior and its evolution and get primacy in determining what a person is and does. Dual-istic unembodied consciousness is excluded. A modified two-way model ofinterlevel causal determinism introduces new principles of downward holistic and subjective cau-sation. Growing adoption in other disciplines suggests the two-way model may be replacing reductive physicalism as the basic explanatory paradigm of science. The practice, methods, and many proven potentials of science are little changed. However, the scientific worldview becomes rad-
R. W. Sperry (Sun,) studied this question.