Brief training in mindfulness may normalize a blunted error-related negativity in chronically depressed patients.

This did not yield a significant Electrode Site × Time × Treatment interaction, F (1, 44) = 0.35, p = .555, η 2 = .00. CRN Analyses of the CRN magnitudes did not yield any main or interaction effects at either FCz or Fz, all p s > .10, apart from a marginally significant main effect of time at Fz, F (1, 44) = 3.04, p = .088, η 2 = .06, due to a decreased CRN at this site at the end of treatment, M i-j = – 0.32, SE = 0.18, p = .088, 95% CI [– 0.69, 0.05]. ∆ ERN The results from analyses of ∆ERN magnitude mirrored those of ERN magnitude.

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The present study was one of the largest to date, in terms of numbers of depressed patients, and given that the observed effect was highly significant and of considerable size, the deficits identified should be considered a robust finding.

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