The mechanisms of efficacy in mindfulness-based interventions for depression and anxiety are not fully understood. To clarify these mechanisms, we tested the hypotheses that mind-wandering, daydreaming, cognitive fusion, and experiential avoidance will decrease through mindfulness group therapy, and this decrease will correlate with improvements in depression and anxiety. Participants self-reported depression and/or anxiety (N = 28) took part in an 8-week mindfulness group therapy program. They were assessed using self-report scales at pre- and post-intervention, and at 2-month follow-up. Results indicated that depression and trait-anxiety decreased between pre- and post-intervention with moderate effect sizes, which were maintained at follow-up. Mind-wandering and cognitive fusion also decreased between pre- and post-intervention with small to moderate effect sizes, and maintained at follow-up. The decreases in mind-wandering and cognitive fusion moderately correlated with improvements in depression and anxiety, suggesting that decreases in mind-wandering and cognitive fusion might underlie efficacious mechanisms of mindfulness group therapy.

中文翻译：

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通过抑郁和焦虑的正念疗法治疗心智流浪和认知融合的变化

对基于正念的抑郁症和焦虑症干预的功效机制尚未完全了解。为了阐明这些机制，我们测试了以下假设：通过正念小组治疗，流浪，做白日梦，认知融合和体验回避会减少，并且这种减少与抑郁和焦虑的改善相关。参与者自我报告的抑郁和/或焦虑（N = 28）参加了为期8周的正念小组治疗计划。在干预前后，以及2个月的随访中使用自我报告量表对他们进行评估。结果表明，干预前和干预后抑郁和特质焦虑有所降低，且效果中等，并在随访中得以维持。干预前后之间的心理徘徊和认知融合也有所减少，效果范围小到中等，并在随访中得以维持。精神流浪和认知融合的减少与抑郁症和焦虑症的改善适度相关，这表明精神流浪和认知融合的减少可能是正念小组治疗有效机制的基础。