Ancient and medieval scholars considered tones related by simple (small-integer)
ratios to be naturally pleasing, but contemporary scholars attribute the special
perceptual status of such sounds to exposure. We investigated the possibility
of processing predispositions for some tone combinations by evaluating infants'
ability to detect subtle changes to patterns of simultaneous and sequential tones.
Infants detected such changes to pairs of pure tones (intervals) only when the
tones were related by simple frequency ratios. This was the case for 9-month-old
infants tested with harmonic (simultaneous) intervals and for 6-month-old infants
tested with melodic (sequential) intervals. These results are consistent with
a biological basis for the prevalence of particular intervals historically and
Maintained by Francis F. Steen, Communication Studies, University of California Los Angeles