Year: 1988 Source: Psychological Medicine, v.18, no.2, (May 1988). p.305-317 SIEC No: 19890676

32 adults with major depressive disorder completed the Hamilton Rating Scale for Depression, Beck Depression Inventory, Present State Examination & Newcastle scale & had contingent negative variation, postimperative negative variation & auditory evoked potential measured before & during antidepressant drug treatment. There were close correlations between all rating scales suggesting that the common variance between them related to the severity of depression.