Effects of auditory pitch and complexity on EEG desynchronization and on verbally expressed judgments.

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Abstract
In 5 experiments eeg responses were recorded and verbal ratings of "complexity," "pleaslngness" (or "pleasantness"), and "Interestlngness" were obtained from Ss [subjects] exposed to auditory patterns of varying pitch and complexity. Mean duration of de synchronization was a U-shaped function of pitch, and white noise produced significantly longer desynchronizatton than pure tones both when equated for intensity and when equated for loudness. No significant difference was found between the mean durations for pairs of tones and single tones or for consonant pairs and dissonant pairs. Judged "complexity" did not follow objective criteria of complexity. The various ratings are discussed in relation to one another, to eeg effects, and to the results of previous experiments in which visual patterns were subjected to similar judgments.

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