The role of time and place cues in the detection of frequency modulation by hearing-impaired listeners
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- Stephan M. A. Ernst
- University of Cambridge Department of Experimental Psychology, , Downing Street, Cambridge, CB2 3EB, United Kingdom
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- Brian C. J. Moore
- University of Cambridge Department of Experimental Psychology, , Downing Street, Cambridge, CB2 3EB, United Kingdom
説明
<jats:p>Frequency modulation detection limens (FMDLs) were measured for five hearing-impaired (HI) subjects for carrier frequencies fc = 1000, 4000, and 6000 Hz, using modulation frequencies fm = 2 and 10 Hz and levels of 20 dB sensation level and 90 dB SPL. FMDLs were smaller for fm = 10 than for fm = 2 Hz for the two higher fc, but not for fc = 1000 Hz. FMDLs were also determined with additional random amplitude modulation (AM), to disrupt excitation-pattern cues. The disruptive effect was larger for fm = 10 than for fm = 2 Hz. The smallest disruption occurred for fm = 2 Hz and fc = 1000 Hz. AM detection thresholds for normal-hearing and HI subjects were measured for the same fc and fm values. Performance was better for the HI subjects for both fm. AM detection was much better for fm = 10 than for fm = 2 Hz. Additional tests showed that most HI subjects could discriminate temporal fine structure (TFS) at 800 Hz. The results are consistent with the idea that, for fm = 2 Hz and fc = 1000 Hz, frequency modulation (FM) detection was partly based on the use of TFS information. For higher carrier frequencies and for all carrier frequencies with fm = 10 Hz, FM detection was probably based on place cues.</jats:p>
収録刊行物
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- The Journal of the Acoustical Society of America
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The Journal of the Acoustical Society of America 131 (6), 4722-4731, 2012-06-01
Acoustical Society of America (ASA)
