Functional magnetic resonance imaging measurements of sound-level encoding in the absence of background scanner noise

Hall, D.A., Haggard, M.P., Summerfield, A.Q., Akeroyd, M.A., Palmer, A.R. and Bowtell, R.W., 2001. Functional magnetic resonance imaging measurements of sound-level encoding in the absence of background scanner noise. The Journal of the Acoustic Society of America, 109 (4), pp. 1559-1570.

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Abstract

Effects of sound level on auditory cortical activation are seen in neuroimaging data. However, factors such as the cortical response to the intense ambient scanner noise and to the bandwidth of the acoustic stimuli will both confound precise quantification and interpretation of such sound-level effects. The present study used temporally "sparse" imaging to reduce effects of scanner noise. To achieve control for stimulus bandwidth, three schemes were compared for sound-level matching across bandwidth: component level, root-mean-square power and loudness. The calculation of the loudness match was based on the model reported by Moore and Glasberg [Acta Acust. 82, 335–345 (1996)]. Ten normally hearing volunteers were scanned using functional magnetic resonance imaging (fMRI) while listening to a 300-Hz tone presented at six different sound levels between 66 and 91 dB SPL and a harmonic-complex tone (F0 = 186 Hz) presented at 65 and 85 dB SPL. This range of sound levels encompassed all three bases of sound-level matching. Activation in the superior temporal gyrus, induced by each of the eight tone conditions relative to a quiet baseline condition, was quantified as to extent and magnitude. Sound level had a small, but significant, effect on the extent of activation for the pure tone, but not for the harmonic-complex tone, while it had a significant effect on the response magnitude for both types of stimulus. Response magnitude increased linearly as a function of sound level for the full range of levels for the pure tone.

Item Type:	Journal article
Alternative Title:	fMRI measurements of sound-level encoding in the absence of background scanner noise
Description:	The following article appeared in: HALL, D.A., HAGGARD, M.P., SUMMERFIELD, A.Q., AKEROYD, M.A., PALMER, A.R. and BOWTELL, R.W., 2001. Functional magnetic resonance imaging measurements of sound-level encoding in the absence of background scanner noise. The Journal of the Acoustic Society of America, 109 (4), pp. 1559-1570, and may be found at (URL/link for published article abstract)."
Publication Title:	The Journal of the Acoustic Society of America
Creators:	Hall, D.A., Haggard, M.P., Summerfield, A.Q., Akeroyd, M.A., Palmer, A.R. and Bowtell, R.W.
Publisher:	Acoustical Society of America
Date:	2001
Volume:	109
Number:	4
Rights:	Copyright 2001 Acoustical Society of America. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the Acoustical Society of America.
Divisions:	Schools > School of Social Sciences
Record created by:	EPrints Services
Date Added:	09 Oct 2015 10:44
Last Modified:	19 Oct 2015 14:36
URI:	https://irep.ntu.ac.uk/id/eprint/17422

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