Accession Number:

AD0745121

Title:

The Effect of Helmet Form on Hearing: Free-Field Thresholds

Descriptive Note:

Technical note

Corporate Author:

HUMAN ENGINEERING LAB ABERDEEN PROVING GROUND MD

Personal Author(s):

• Randall, R. Bradley
• Holland, Howard H.

Report Date:

1972-04-01

Pagination or Media Count:

20.0

Abstract:

Audiometric threholds were determined for 12 subjects under three head conditions bareheaded, while wearing an M1 helmet, and wearing an experimental helmet. The thresholds were measured for seven tones 125, 250, 500, 1000, 2000, 4000 and 8000 Hz, at each of five angular orientations. Statistically noteworthy differences were studied for main effects and interactions. These appear to fall within the range of variation most people ordinarily experience on a day-to-day basis.

Descriptors:

• *HELMETS
• *AUDIOMETRY
• FREQUENCY
• TEST METHODS
• HUMAN FACTORS ENGINEERING
• AUDITORY PERCEPTION
• ACOUSTIC SIGNALS
• THRESHOLDS(PHYSIOLOGY)

Subject Categories:

• Anatomy and Physiology
• Protective Equipment

Distribution Statement:

APPROVED FOR PUBLIC RELEASE