Mindfulness has attracted considerable interest as a way to reduce cognitive vulnerability to stress and emotional distress, but it has not been defined operationally. Recent consensus meetings produced a two-component model of mindfulness, specifying each component in terms of specific behaviors, experiential manifestations, and psychological processes. The paper addresses temporal stability and situational specificity, speculates on the conceptual and operational distinctiveness of mindfulness, and discusses implications for instrument development and measurement.
A new self-report questionnaire, the Toronto Mindfulness Scale (TMS), measures the state of mindfulness. In two studies, the scale showed good internal consistency and two factors: Curiosity and Decentering. TMS scores increased with more mindfulness meditation experience. In a second study, participants in an 8-week mindfulness-based stress reduction program showed increased TMS scores after treatment, and Decentering scores predicted improvements in clinical outcomes. The TMS is a promising measure with good psychometric properties and predictive validity for treatment outcome.