Estimates of auditory filter phase response at and below characteristic frequency (L)

Animal studies in basal cochlear regions have shown that basilar-membrane phase curvature (or rate of change of group delay with frequency) is negative around characteristic frequency (CF), but near zero well below CF. This study examined whether psychophysical masking experiments in humans show the...

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Bibliographic Details
Published in:The Journal of the Acoustical Society of America 2005-04, Vol.117 (4), p.1713-1716
Main Authors: OXENHAM, Andrew J, EWERT, Stephan D
Format: Article
Language:English
Subjects:
Acoustics
Adult
Attention - physiology
Audition
Auditory Threshold - physiology
Basilar Membrane - physiology
Biological and medical sciences
Cochlea - physiology
Dichotic Listening Tests
Exact sciences and technology
Female
Filtration - methods
Fundamental and applied biological sciences. Psychology
Fundamental areas of phenomenology (including applications)
Humans
Loudness Perception - physiology
Male
Perception
Perceptual Masking - physiology
Physics
Pitch Perception - physiology
Psychoacoustics
Psychology. Psychoanalysis. Psychiatry
Psychology. Psychophysiology
Psychomotor Performance - physiology
Sound Spectrography
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Summary:Animal studies in basal cochlear regions have shown that basilar-membrane phase curvature (or rate of change of group delay with frequency) is negative around characteristic frequency (CF), but near zero well below CF. This study examined whether psychophysical masking experiments in humans show the same difference between on- and off-CF phase curvature. Masked thresholds were measured for a 2-kHz signal in the presence of harmonic tone complex maskers with a fundamental frequency of 100 Hz, band-limited between 200 and 1400 Hz (off-frequency masker) or between 1400 and 2600 Hz (on-frequency masker). The results from four normal-hearing listeners are consistent with predictions from animal physiological data: negative phase curvature is found for the on-frequency masker, whereas the phase curvature for the off-frequency masker is near zero. The method and results provide a strong test for the temporal response of computational models of human cochlear filtering.
ISSN:0001-4966
1520-8524
DOI:10.1121/1.1863012