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Auditory Temporal Processing and its Disorders$
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Jos J. Eggermont

Print publication date: 2015

Print ISBN-13: 9780198719090

Published to Oxford Scholarship Online: May 2015

DOI: 10.1093/acprof:oso/9780198719090.001.0001

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PRINTED FROM OXFORD SCHOLARSHIP ONLINE (oxford.universitypressscholarship.com). (c) Copyright Oxford University Press, 2021. All Rights Reserved. An individual user may print out a PDF of a single chapter of a monograph in OSO for personal use. date: 06 December 2021

Gap-detection and voice-onset-time

Gap-detection and voice-onset-time

(p.66) Chapter 4 Gap-detection and voice-onset-time
Auditory Temporal Processing and its Disorders

Jos Eggerrmont

Oxford University Press

Gap-detection is based on similar mechanisms as forward masking; if the recovery from the masking induced decrease in available transmitter (inducible firing rate) is too little, the gap between the masker and the test stimulus may not be detected. When the masker and the test stimulus are the same in frequency or frequency content, the detection of a gap amounts to hearing a discontinuity. This is called within channel gap detection. When the masker has a different frequency content than the test stimulus, a between channel condition, the minium gap that can be detected is typically larger than for the within channel condition. This requires a comparison of changes in activity between different sets of neurons. This is also the case for voice-onset-time, which is the delay between a voiceless consonant and a voiced vowel. Voice-onset-time may determine categorical perception; around VOT=30ms perception in English speakers switches for instance between /pa/ and /ba/. This categorical perception corresponding to a “minimum detectable VOT” is also represented in cortical evoked potentials, either recorded from the scalp or intracranially. This minimum VOT stays the same appears for other contrasts such as /da/ and /ta/ and is thus unrelated to categorical perception thereof. In cortical single unit recordings for a gap between noise bursts, a clear distinction arises between gaps inserted > 200 ms after noise burst onset and a gap inserted after 5-10 ms. The late minimum gap is about 5 ms, whereas the early minimum gap is close to 40 ms.

Keywords:   voice-onset-time, within channel, between channel, categorical perception, electrophysiology, imaging

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