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Alice M. Isen, Thomas E. Shalker, The Effect of Feeling State on Evaluation of Positive, Neutral, and Negative Stimuli: When You "Accentuate the Positive," Do You "Eliminate the Negative"?, Social Psychology Quarterly, Vol. 45, No. 1 (Mar., 1982), pp. 58-63
Isen et al. (1982) studied this question.