Auditory intensity processing: Effect of MRI background noise

Hearing Research
Nicole AngensteinAndré Brechmann

Abstract

Studies on active auditory intensity discrimination in humans showed equivocal results regarding the lateralization of processing. Whereas experiments with a moderate background found evidence for right lateralized processing of intensity, functional magnetic resonance imaging (fMRI) studies with background scanner noise suggest more left lateralized processing. With the present fMRI study, we compared the task dependent lateralization of intensity processing between a conventional continuous echo planar imaging (EPI) sequence with a loud background scanner noise and a fast low-angle shot (FLASH) sequence with a soft background scanner noise. To determine the lateralization of the processing, we employed the contralateral noise procedure. Linearly frequency modulated (FM) tones were presented monaurally with and without contralateral noise. During both the EPI and the FLASH measurement, the left auditory cortex was more strongly involved than the right auditory cortex while participants categorized the intensity of FM tones. This was shown by a strong effect of the additional contralateral noise on the activity in the left auditory cortex. This means a massive reduction in background scanner noise still leads to a significant l...Continue Reading

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Citations

Aug 29, 2019·Human Brain Mapping·André Brechmann, Nicole Angenstein
Jun 6, 2017·Human Brain Mapping·Nicole Angenstein, André Brechmann
Feb 7, 2021·Neuroscience·Beate WendtNicole Angenstein

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