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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.
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Hayes et al. (2004) studied this question.
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