The importance of “temporal pattern” in traumatic impulse noise exposures

R. Danielson, D. Henderson, M. A. Gratton, L. Bianchi, R. Salvi

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


The equal energy hypothesis (EEH) was evaluated for impulse noise. Specifically, the experiments evaluated the importance of the temporal distribution of impulses; the trading relation between the number of impulses and peak level and the difference between continuous and impulse noise. Monaural chinchillas were exposed to one of seven conditions. Their hearing was evaluated before, immediately after, and 30 days after the exposure. Hair cell damage was reported in the form of a cochleogram. The experiments show that the EEH is more appropriate for low-level impulse (135-dB peak); for equal amounts of energy, 150-dB impulses produce more hearing loss and hair cell damage than 135-dB impulses; for equal amounts of energy, impulses presented in rapid bursts cause less damage than impulses presented at “1/s” and 50 μS. Pairs of impulses presented at “1/s” produce the largest amount of damage. The results are discussed in terms of implications for the EEH.

Original languageEnglish
Pages (from-to)209-218
Number of pages10
JournalJournal of the Acoustical Society of America
Issue number1
StatePublished - Jul 1991


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