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Time‐course of the auditory BOLD response to scanner noise
Author(s) -
Hall Deborah A.,
Summerfield A. Quentin,
Gonçalves Miguel S.,
Foster John R.,
Palmer Alan R.,
Bowtell Richard W.
Publication year - 2000
Publication title -
magnetic resonance in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.696
H-Index - 225
eISSN - 1522-2594
pISSN - 0740-3194
DOI - 10.1002/(sici)1522-2594(200004)43:4<601::aid-mrm16>3.0.co;2-r
Subject(s) - scanner , stimulus (psychology) , auditory cortex , noise (video) , auditory system , audiology , acoustics , computer science , psychology , neuroscience , physics , computer vision , artificial intelligence , medicine , image (mathematics) , psychotherapist
It is a concern for auditory fMRI studies that acoustic noise generated by the scanner produces an auditory response that can confound stimulus‐induced activation. To establish how to minimize this problem, the present study mapped the time‐course of the auditory response to a burst of acoustic scanner noise by employing a single‐event method. Recorded bursts of scanner noise were interspersed with clustered‐volume acquisitions at a range of stimulus‐to‐imaging delays to map the response with a temporal resolution of 1 sec. There were strong responses (1.5% signal change) to scanner noise in primary and secondary auditory cortex. In both cortical areas, the mean response rose to a peak by 4–5 sec after stimulus onset and decayed after a further 5–8 sec. The time course indicates that noise contamination in auditory fMRI can be substantially reduced by using a 9–12‐sec repetition time, thus maximizing the dynamic range available for displaying the response to acoustical stimuli of interest. Magn Reson Med 43:601–606, 2000. © 2000 Wiley‐Liss, Inc.