Effects of forward and simultaneous masking on intensity discrimination
作者:
Gregory P. Widin,
Neal F. Viemeister,
Sid P. Bacon,
期刊:
The Journal of the Acoustical Society of America
(AIP Available online 1986)
卷期:
Volume 80,
issue 1
页码: 108-111
ISSN:0001-4966
年代: 1986
DOI:10.1121/1.394170
出版商: Acoustical Society of America
数据来源: AIP
摘要:
Experiments on intensity discrimination determine the size of the smallest detectable increment added to a fixed pedestal. This paper examines the effects of a masker which either precedes the pedestal (forward masking) or is simultaneous with the pedestal. The increment and pedestal were 1‐kHz tones masked in forward masking by pure tones and in simultaneous masking by a broadband noise. Simultaneous masking by the broadband noise eliminates the ‘‘near miss’’ to Weber’s law, and thus degrades intensity discrimination at high pedestal levels. Forward masking by the pure tone also degrades intensity discrimination, which may, in part, be explained by the elimination of the near miss. However, the effect on intensity discrimination in some cases is greater in forward than in simultaneous masking, suggesting that some additional process (e.g., adaptation) is involved.
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