Accession Number : AD0467139

Title :   SOME PRELIMINARY STUDIES OF TEMPORARY THRESHOLD SHIFT WITH AN ARC-DISCHARGE IMPULSE NOISE GENERATOR,

Corporate Author : ARMY MEDICAL RESEARCH LAB FORT KNOX KY

Personal Author(s) : Loeb, Michel ; Fletcher, John L. ; Benson, Robert W.

Report Date : 17 MAY 1965

Pagination or Media Count : 6

Abstract : Preliminary studies with an arc-discharge (sparkgap) impulse-noise generator produced data not entirely in line with previous experiments (employing longer pulses) with respect to the effects of variation of number and spacing of pulses and preactivation of the acoustic reflex n temperorary threshold shift (TTS). Specifically, growth of TTS with number of pulses was not linear but was less than logarithmic, and moderately loud sounds before each pulse, presumably intense enough to activate the reflex, were ineffective in reducing TTS. On the other hand, when an equal number of impulses were presented at a fast repetition rate, or when more intense activating stimuli were presented at a slow pulse-repetition rate, less TTS was observed. The TTS observed was greatest at high frequencies, especially at 6000 cps and above. (Author)

Descriptors :   (*NOISE GENERATORS, ACOUSTICS), (*AUDITORY PERCEPTION, NOISE GENERATORS), THRESHOLDS(PHYSIOLOGY), ELECTRIC ARCS, AUDITORY SIGNALS, PULSE GENERATORS, FREQUENCY, INTENSITY, TIME, REACTION(PSYCHOLOGY), HEARING.

Distribution Statement : APPROVED FOR PUBLIC RELEASE