Changes in Ruminative Thinking Mediate the Clinical Benefits of Mindfulness: Preliminary Findings

We investigated whether the clinical benefits of mindfulness training are mediated by a reduction in maladaptive rumination
and an increase in adaptive rumination. Participants in eight-session mindfulness training were assessed before and after
treatment, while waiting-list controls were assessed at similar times. For the mindfulness training, a treatment manual was
derived from the mindfulness-based cognitive therapy procedure and adapted to account for the consequences of stress, anxiety,
and depression rather than just depression. Replicating previous findings, results indicate that mindfulness training, as
compared to the waiting-list condition, reduces general psychopathology. It was also found that mindfulness training reduces
maladaptive rumination and increases adaptive rumination. Mediational analyses further suggest that clinical benefits of mindfulness
required changes in ruminative mode of processing. Results are discussed in terms of Teasdale et al.’s assumption that mindfulness
training is effective because it reduces maladaptive rumination.