C. Daniel Batson, Jay S. Coke, Fred Chard, Debra Smith, Antonia Taliaferro, Generality of the "Glow of Goodwill": Effects of Mood on Helping and Information Acquisition, Social Psychology Quarterly, Vol. 42, No. 2 (Jun., 1979), pp. 176-179
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Batson et al. (1979) studied this question.