Abstract
Twenty melodic tone sequences varying in harmonic structure were first presented once each to listeners selected from three different levels of previous musical training. Listeners rated each sequence on a 6-point scale of "pleasingness". Next, 5 sequences from the original set of 20 were each repeated 10 times in a row and rated after each repetition. The 5 sequences were assigned to listeners so that across listeners the 20 original sequences were equally represented. Finally, all 20 sequences were again each presented once for rating. At all levels of musical training, listeners showed a monotonic relationship between "pleasingness" and level of harmonic structure, with highest ratings of "pleasingness" associated with the highest level of structure. During repeated exposures, judged "pleasingness" increased at all levels of harmonic structure except the highest level, where a decrease of "pleasingness" with exposure was obtained. The effects of repetition did not, however, extend to the final ratings of the original set of 20 sequences. The data are discussed with reference to the optimal- complexity model of aesthetic judgement; specific attention is directed toward the cognitive processes determining sequence complexity.
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