Azimuthal auditory localization of gunshots in a realistic field environment: effects of open-ear versus hearing protection-enhancement devices (HPEDs), military vehicle noise, and hearing impairment.

Abstract:

OBJECTIVE:A controlled field experiment was conducted to evaluate localization of suprathreshold gunshot reports (from blank cartridges) with four hearing protection-enhancement devices (HPEDs) in comparison to the open ear with ambient outdoor noise and in 82 dBA diesel military heavy truck noise. DESIGN:Five measures of localization accuracy and response time for eight shooter positions in azimuth were measured. STUDY SAMPLE:Nine normal-hearing and four impaired-hearing participants were tested. RESULTS:Statistical analysis showed worse accuracy and response time performance with the electronic earmuffs (Peltor Com-Tac II™ in full gain position) than with the other tested HPEDs (Etymotic EB 1 and EB 15 High-Fidelity Electronic BlastPLG™ electronic earplugs, both set to Lo gain positions; and 3M Single-Ended Combat Arms™ passive earplug in level-dependent, "open" position). Performance with all HPEDs was worse than that with the open ear, except on right-left confusions, in which the earmuff stood alone as worst, and in response time, for which the EB 1 was equivalent to the open ear. There was no significant main effect of noise on performance. Hearing impairment increased right-left confusions. Subjective ratings related to localization generally corroborated objective localization performance. CONCLUSIONS:None of the tested HPEDs preserved "normal" localization performance.

journal_name

Int J Audiol

authors

Talcott KA,Casali JG,Keady JP,Killion MC

doi

10.3109/14992027.2011.631591

subject

Has Abstract

pub_date

2012-02-01 00:00:00

pages

S20-30

eissn

1499-2027

issn

1708-8186

journal_volume

51 Suppl 1

pub_type

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