Rare technical term in philosophy or psychology, referring to the theory that mind and body interact. The more common term is 相互作用説.
See also: 相互作用説
Interactionism is a form of dualism in the mind-body problem.
Compound of 交互 (alternate, mutual) + 作用 (action, effect) + 説 (theory). The exact historical derivation is uncertain; it is a technical calque for 'interactionism'.