Cognitive functioning in depression: a review of theory and research

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Abstract
SynopsisThis paper reviews recent research into cognitive functioning in depression, with particular reference to the theories of Lewinsohn, Beck, Seligman and Klein. The major cognitive changes in depression are a decrease in the ability to maintain concentration and effort, and an increase in the relative salience of aversive events and memories, with a corresponding decrease in the salience of pleasant events. There is as yet little evidence to support the view that depressions arise out of pre-existing depressive attitudes. Attention is drawn to the heterogeneity of depressive disorders, and the significance of the endogenous/non-endogenous distinction is discussed.