Developmental changes in infants' sensitivity to octave-band noises |
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Authors: | Sandra E Trehub Bruce A Schneider Maxine Endman |
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Institution: | Centre for Research in Human Development, Erindale College, University of Toronto, Mississauga, Ontario, Canada L5L 1C6 |
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Abstract: | Localization responses to octave-band noises with center frequencies at 200, 400, 1000, 2000, 4000, and 10,000 Hz were obtained from infants 6, 12, and 18 months of age. During an experimental trial, an octave-band noise was presented on one of two speakers located 45° to each side of the infant. A head turn to the noise (correct response) was rewarded by activating an animated toy on top of the speaker. The intensity of the noise was varied over trials (method of constant stimuli) to determine thresholds at each center frequency. Thresholds for the lower frequencies were approximately 5–8 db higher in the 6-month-old infants compared to the older infants. However, there were no consistent differences among groups at the higher frequencies. Infant thresholds were found to be 20–30 db higher than adult thresholds at the lower frequencies. At the higher frequencies thresholds for infants were approaching those of adults. |
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Keywords: | Requests for reprints should be sent to Sandra E Trehub Centre for Research in Human Development Erindale College University of Toronto Mississauga Ontario Canada L5L 1C6 |
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