The finding that nondepressed individuals, relative to depressed individuals are less accurate in their assessments of the degree of contingency between their responses and outcomes relative to the objective degree of contingency. Nondepressed individuals overestimated the degree of contingency between their responses and outcomes when noncontingent outcomes were frequent and/or desired. Nondepressed individuals underestimated the degree of contingency when contingent outcomes were undesired.
Alloy, L. B., & Abramson, L. Y. (1979). Judgment of contingency in depressed and nondepressed students: Sadder but wiser? Journal of Experimental Psychology: General, 108(4), 441-485. doi: 10.1037/0096-34188.8.131.521.