How does metacognitive training ease depression in older adults?
For older adults with depression, a group metacognitive training programme reduced rumination and negative beliefs more than a brain-training control, and these changes statistically accounted for later improvements, though which one mattered depended on who rated the depression.
Source
Negative cognitive beliefs, positive metacognitive beliefs, and rumination as mediators of metacognitive training for depression in older adults (MCT-Silver)
Study at a glance
- Design
- RCT — Secondary analysis of an RCT (1:1 randomisation, blinded raters) comparing 8 weekly sessions of group MCT-Silver with computerised cognitive remediation; parallel mediation models (PROCESS, 5,000 bootstraps) with mediator change from baseline to post and depression change from baseline to 3-month follow-up
- N
- N=66 · 66 trial participants with complete baseline data (a subsample of the full RCT); missing post and follow-up data imputed with expectation-maximisation.
- Population
- Adults aged 60 and over in Germany with current major depression, recurrent depression or dysthymia, mostly mild to moderate
- Outcome
- Clinician-rated depression (Hamilton scale) and self-rated depression (BDI-II) at 3-month follow-up; mediators were dysfunctional attitudes (DAS-18B), positive metacognitive beliefs (MCQ-30 subscale) and rumination (RRS-10)
Structured fields used in claim comparison tables when every cited study has a complete layer.
What they did
The authors re-analysed data from their randomised trial in which adults aged 60 or older with depression attended either 8 weekly group sessions of Metacognitive Training-Silver (a CBT-based programme that teaches people to notice thinking biases) or weekly computerised brain-training sessions as an active control. They measured three possible mechanisms at the start and end of treatment: dysfunctional negative beliefs, positive beliefs about worrying, and rumination. They then tested whether changes in these mechanisms explained changes in depression from baseline to a 3-month follow-up, rated both by clinicians and by patients themselves.
What they found
Compared with the control, the training produced larger reductions in rumination, negative beliefs and positive metacognitive beliefs by the end of treatment. It reduced self-rated depression at follow-up but not clinician-rated depression, matching the main trial. Reduced rumination mediated the effect on clinician-rated depression, while reduced negative beliefs mediated the effect on self-rated depression. Positive metacognitive beliefs did not mediate either outcome, and results held after controlling for age of depression onset and number of episodes.
The limits
What it doesn't show
Mediators and outcomes were measured over overlapping periods with only three time points, so the study cannot establish that changes in rumination or beliefs came before and caused the drop in depression. The mediators differed for clinician-rated and self-rated depression, so no single mechanism can be named with confidence. The analysis used a subsample of the trial with imputed missing data, and participants mostly had mild to moderate, often chronic symptoms, so results may not apply to severe depression. The main trial found no significant treatment effect on clinician-rated depression, so that mediation result is an indirect effect without a total effect.
Key terms
- Mediator
- A variable that the treatment changes and that in turn changes the outcome, proposed as the pathway through which a treatment works.
- Rumination
- Repetitive, passive dwelling on one's negative feelings and their causes and consequences; a known maintaining factor in depression.
- Dysfunctional attitudes
- Rigid negative beliefs, such as 'if I fail, I am worthless', that cognitive theories say make people vulnerable to depression.
- Positive metacognitive beliefs
- Beliefs that worrying or ruminating is helpful, for example that it helps one cope or avoid problems.
- Active control condition
- A comparison treatment that matches the time and attention of the real intervention but lacks its supposed active ingredients.
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Quiz yourself
What type of study is this?
Common questions
Can there be mediation if the treatment had no overall effect on clinician-rated depression?
Statistically, yes: an indirect path through a mediator can be significant even when the total effect is not. The authors follow guidance that recommends testing for this, but it makes the finding harder to interpret.
Why might the clinician and self-report measures give different answers?
The Hamilton scale focuses more on bodily symptoms and may underestimate cognitive symptoms, while the BDI-II captures negative thoughts that overlap with dysfunctional attitudes. That may explain why negative beliefs mediated only the self-reported outcome.
Why use brain training as the control?
It matches the weekly time and contact with staff, so any extra benefit of the metacognitive training is less likely to be due to attention or routine alone.
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