The effects of rate and forward masking on human adult and newborn auditory evoked brainstem response thresholds
作者:
Robert E. Lasky,
期刊:
Developmental Psychobiology
(WILEY Available online 1991)
卷期:
Volume 24,
issue 1
页码: 51-64
ISSN:0012-1630
年代: 1991
DOI:10.1002/dev.420240105
出版商: Wiley Subscription Services, Inc., A Wiley Company
数据来源: WILEY
摘要:
AbstractSeveral investigators have reported that human newborn auditory brainstem evoked response (ABR) thresholds to clicks are about 10‐20 dB higher than human adult thresholds to the same stimuli (Galambos amp; Hecox, 1978; Shulman‐Galambos amp; Galambos, 1979; Lasky, Rupert, amp; Waller, 1987). The present study replicated these results, but, in addition, addressed developmental differences in ABR thresholds due to forward masking and changes in stimulus repetition rate. Eight human newborns and seven human adults served as subjects. Newborn ABR thresholds to a 100 μs click which followed a 82 db (A) SPL 50 ms broadband forward masker by 10 ms were significantly more elevated relative to their unmasked ABR thresholds than were those of the adults. Relatively loud sounds seem to have a greater effect on the newborn's ability to process subsequently presented soft sounds than they do on adult processing. In contrast, changes in repetition rate of 100μs clicks from 10/s to 50/s had no greater effect on newborn than adult ABR thresholds. At near threshold stimulus levels, rate effects on the ABR are not apparent in newborns nor a
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