Accession Number : AD0620536

Title :   MEASUREMENT OF AUDITORY THRESHOLDS,

Corporate Author : LOCKHEED MISSILES AND SPACE CO PALO ALTO CALIF LOCKHEED PALO ALTO RESEARCH LAB

Personal Author(s) : Brown,A. E.

Report Date : 02 APR 1965

Pagination or Media Count : 7

Abstract : Two different techniques for determination of thresholds were developed. In the first, called a fixed-point determination, tones of a fixed amplitude and constant duration are presented to a subject on a random basis. The tone is masked by white noise and the subject must identify the presence of the tone. A statistical analysis of his response will determine the probability of correctly identifying the presence of the tone. By presenting various levels of tone amplitude, it is possible to determine the threshold function. The second technique involves adjusting the amplitude of the randomly presented tone such that it is maintained at a level slightly below the 50% probability level. The two techniques have excellent agreement and form a convenient pair for psychophysical investigation. The first technique is slow, but produces the entire threshold function, while the second, faster system gives information on one probability value only. (Author)

Descriptors :   (*HEARING, THRESHOLDS(PHYSIOLOGY)), (*THRESHOLDS(PHYSIOLOGY), HEARING), AUDITORY PERCEPTION, PSYCHOPHYSIOLOGY, DETERMINATION, AUDITORY SIGNALS, PROBABILITY, NOISE, STATISTICAL ANALYSIS, PSYCHOLOGICAL TESTS

Distribution Statement : APPROVED FOR PUBLIC RELEASE