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The authors examined the role of intrinsic interest in mediating the relationship among mood, processing goals, and task performance. Participants in induced happy, neutral, or sad moods generated similarities and differences between TV shows using performance-based, enjoyment-based, or no stop rule (cf. L.L. Martin, D.W. Ward, J.W. Achee, & R.S. Wyer, 1993). Pretask interest and both quantitative (time spent, number generated) and qualitative (creativity) performance were assessed. Happy participants spent more time and generated more items than other participants when using an enjoyment-based stop rule but spent less time and generated fewer items when using a performance-based stop rule. Happy participants also expressed greater pretask interest and were more creative than other participants regardless of stop rule. Regression-based path analyses indicated that pretask interest partially mediated the effects of mood on quantitative performance but not on creativity.
Hirt et al. (Mon,) studied this question.