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Laryngeal aging and the acoustic and temporal changes of ultrasonic vocalizations in aged rats
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[Fort Worth, Tex.] : Texas Christian University,
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2010
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Human voice quality changes with senescence. There are corresponding age-related changes in laryngeal morphology. We investigated acoustic features of USVs in Long Evans male rats (Rattus norvegicus), young (5 months), middle-aged (18 months) and aged (26 months). Young rats produced more calls, followed by aged, and middle-aged. Cross-sectional analysis of all calls revealed that USVs of young rats were higher in mean peak frequency, amplitude, and max frequency, compared to middle-aged but they did not differ significantly from aged. Young rats produced more higher frequency calls, but the middle-aged and aged produced more lower frequency USVs and audible calls. These data suggest that age-related changes in USVs occur before 18 months. Histology revealed positive correlations between elastin and maximum frequency of USVs, while hyaluronic acid was positively correlated with peak frequency and maximum frequency. This data indicate that USVs may degrade due to micro-structural changes to aging vocal fold tissue.
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Psychology