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There are scientific advantages to defining mindfulness in terms of the psychological processes involved. Doing so, however, necessarily uncouples mindfulness from any given technology, including meditation. Defining mind-fulness in terms of the self-regulation of attention and a posture of acceptance seems progressive, but there are underlying philosophical attachments in the proposed definition that might limit its applicability if they are treated too rigidly.
Hayes et al. (Thu,) studied this question.