Effects of continuous masking noise on tone-evoked magnetic fields in humans

Brain Research
Takeshi MoritaJuichi Ito

Abstract

Two different types of steep loudness growth have been reported in detail in psychoacoustical studies but have rarely been evaluated by objective methods in humans. One occurs in inner-ear hearing-impaired patients and is known as loudness recruitment. Another similar phenomenon is observed in healthy subjects with concurrent presence of background noise. Concerning the first type, our previous study using magnetoencephalography (MEG) showed that enhancement of the dipole moment of N100m with increase in stimulus intensity was greater in patients than in normal individuals. However, it is unclear whether the enhancement of activity in auditory cortex will also be detected with background noise in healthy subjects. To elucidate the effects of continuous background noise on tone-evoked cortical activity, we measured auditory-evoked magnetic fields (AEFs) from 7 normal-hearing subjects in two different conditions, with and without 55 dB SPL continuous masking white noise (noise/quiet conditions). The stimuli were 200 ms 1-kHz tones delivered monaurally and randomly at 4 different intensities (40-70 dB SPL) with constant 1-s interstimulus intervals. The N100m increased in amplitude and decreased in latency as a function of stimulus...Continue Reading

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Citations

Oct 22, 2008·Cerebral Cortex·Henning StrackeChristo Pantev
Jun 5, 2010·Journal of Cognitive Neuroscience·Hidehiko OkamotoChristo Pantev
Nov 3, 2012·Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology·S C PurdyC L A Morgan
Jun 30, 2009·The European Journal of Neuroscience·Claude AlainPatricia Van Roon
Mar 29, 2011·Neuroscience Letters·Tadao OkayasuHiroshi Hosoi
Feb 11, 2015·Hearing Research·Nelli H SalminenVille Pulkki
Nov 27, 2014·Frontiers in Neural Circuits·Feixue LiangZhongju Xiao

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