Frequency spectra of the cries of normal infants and those with Down’s Syndrome

Abstract

Samples of tape recorded crying obtained from four male mongoloid infants six months of age, and four normal infants matched for age and sex were fed into the Panoramic Sonic Analyzer in order to survey the frequency (c. p. s.) content of the cries. While the frequency ranges did not differ for the two groups, the cries of the normal infants were richer in spectral content, more active, less variable in sound level and more homogeneous as a group than those of the mongoloid infants. © 1966, Psychonomic Press. All rights reserved.