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000056237 084__ $$2WoS$$aNeurosciences
000056237 084__ $$2WoS$$aNeuroimaging
000056237 084__ $$2WoS$$aRadiology, Nuclear Medicine & Medical Imaging
000056237 1001_ $$0P:(DE-Juel1)131794$$aShah, J. N.$$b0$$uFZJ
000056237 245__ $$aThe effect of sequence repeat time on auditory cortex stimulation during phonetic discrimination
000056237 260__ $$aOrlando, Fla.$$bAcademic Press$$c2000
000056237 29510 $$aNeuroImage Volume 12, Issue 1, July 2000, Pages 100-108
000056237 300__ $$a100 - 108
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000056237 520__ $$aAcoustic noise generated by the MR scanner gradient system during fMRI studies of auditory function is a very significant potential confound. Despite these deleterious effects, fMRI of the auditory cortex has been successful and numerous practitioners have circumvented the problem of acoustic masking noise. In the context of auditory cortex fMRI, the sequence repeat time (TR) has the effect of altering the length of time during which the scanner is quiet. Indeed, the move to whole-brain fMRI makes the problem of acoustic noise more acute and points to the need to examine the role of TR and its influence on the BOLD signal. The aim of this study was to examine the effect of varying the TR time on activation of auditory cortex during presentation and performance of a phonetic discrimination task. The results presented here demonstrate that the influence of sequence repeat time is considerable. For a short repeat time it is likely that the noise from the scanner is a significant mask and hinders accurate task performance. At the other extreme, a repeat time of 9 s is also suboptimal, probably due to attentional effects and lack of concentration and not least because of the longer overall measurement times. The results of this study point to a complicated interplay between psychophysical factors as well as physical parameters; attention, acoustic noise, total duration of the experiment, consideration of the volume of acquisition, and overall difficulty of the task have to be assessed and balanced. For the paradigm used here, the results suggest an optimal TR of around 6 s for a 16-slice acquisition.
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000056237 542__ $$ldoi:10.1006/nimg.2000.0588
Copyright © 2000 Academic Press
000056237 588__ $$aDataset connected to Web of Science, Pubmed
000056237 650_2 $$2MeSH$$aArtifacts
000056237 650_2 $$2MeSH$$aAuditory Cortex: physiology
000056237 650_2 $$2MeSH$$aDiscrimination (Psychology): physiology
000056237 650_2 $$2MeSH$$aHumans
000056237 650_2 $$2MeSH$$aMagnetic Resonance Imaging: instrumentation
000056237 650_2 $$2MeSH$$aMale
000056237 650_2 $$2MeSH$$aNoise
000056237 650_2 $$2MeSH$$aPerceptual Masking
000056237 650_2 $$2MeSH$$aPhonetics
000056237 650_2 $$2MeSH$$aTime Factors
000056237 650_7 $$2WoSType$$aJ
000056237 7001_ $$0P:(DE-Juel1)VDB1574$$aSteinhoff, S.$$b1$$uFZJ
000056237 7001_ $$0P:(DE-Juel1)VDB1072$$aMirzazade, S.$$b2$$uFZJ
000056237 7001_ $$0P:(DE-Juel1)VDB1826$$aZafiris, O.$$b3$$uFZJ
000056237 7001_ $$0P:(DE-Juel1)VDB508$$aGrosse-Ruyken, M. L.$$b4$$uFZJ
000056237 7001_ $$0P:(DE-HGF)0$$aJäncke, R. K.$$b5
000056237 7001_ $$0P:(DE-Juel1)131714$$aZilles, K.$$b6$$uFZJ
000056237 773__ $$0PERI:(DE-600)1471418-8$$gVol. 12, p. 100 - 108$$p100 - 108$$q12<100 - 108$$tNeuroImage$$v12$$x1053-8119$$y2000
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