Neural correlates of psychophysical release from masking

Responses of chinchilla auditory-nerve fibers were measured for stimulus conditions analogous to those in which psychophysical release from masking has been observed in humans. The maskers were two equal power, narrow-band noise stimuli with different amplitude envelopes. The neurons in the sample f...

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Veröffentlicht in:The Journal of the Acoustical Society of America 1990-12, Vol.88 (6), p.2682-2691
Hauptverfasser: MOTT, J. B, MCDONALD, L. P, SINEX, D. G
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MCDONALD, L. P
SINEX, D. G
description Responses of chinchilla auditory-nerve fibers were measured for stimulus conditions analogous to those in which psychophysical release from masking has been observed in humans. The maskers were two equal power, narrow-band noise stimuli with different amplitude envelopes. The neurons in the sample fell into three groups that resolved the maskers' envelopes with varying degrees of accuracy. The boundaries of these groups were not sharply delineated by characteristic frequency (CF) but were dependent on the relationship between the masker level and the neurons' thresholds at the masker frequency. For the neurons that best preserved the maskers' envelope fluctuations, a neural release from masking was observed; rate-based neural masked thresholds were higher for the masker with the least fluctuating envelope. The results suggest that neural and psychophysical release from masking arises because the probe evokes larger rate changes, relative to the background response to the masker, during periods of low masker energy. Between two otherwise equivalent maskers, the one with the periods of lowest energy will produce the lower masked thresholds because rate changes are larger and more detectable.
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Psychology</topic><topic>Nerve Fibers - physiology</topic><topic>Neurons - physiology</topic><topic>Perceptual Masking - physiology</topic><topic>Pitch Discrimination - physiology</topic><topic>Psychoacoustics</topic><topic>Vertebrates: nervous system and sense organs</topic><topic>Vestibulocochlear Nerve - physiology</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>MOTT, J. B</creatorcontrib><creatorcontrib>MCDONALD, L. P</creatorcontrib><creatorcontrib>SINEX, D. 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source MEDLINE; Acoustical Society of America (AIP)
subjects Animals
Auditory Threshold - physiology
Biological and medical sciences
Chinchilla
Ear and associated structures. Auditory pathways and centers. Hearing. Vocal organ. Phonation. Sound production. Echolocation
Evoked Potentials, Auditory - physiology
Fundamental and applied biological sciences. Psychology
Nerve Fibers - physiology
Neurons - physiology
Perceptual Masking - physiology
Pitch Discrimination - physiology
Psychoacoustics
Vertebrates: nervous system and sense organs
Vestibulocochlear Nerve - physiology
title Neural correlates of psychophysical release from masking
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