Hemispheric asymmetry in N100m current sources in auditory evoked fields: Comparison of ipsilateral versus contralateral responses

Jin, Chun Yu; Ozaki, Isamu; Suzuki, Yasumi; Baba, Masayuki; Hashimoto, Isao

doi:10.1016/j.ics.2007.01.033

Cited by 3 publications

(1 citation statement)

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“…These effects include hemispheric asymmetry in the latency of the M100 peak and in magnetic field amplitude during the M100 rise. An earlier M100 peak has been observed in the right hemisphere for a variety of stimuli, including tones (Gabriel, et al, 2004; Huotilainen, et al, 1998; Jin, et al, 2007; Kanno, et al, 2000; Kirveskari, et al, 2006; Pardo, et al, 1999; Roberts, et al, 2000; Rosburg, et al, 2002; Salajegheh, et al 2004), vowels (Kirveskari, et al, 2006; Poeppel, et al, 1997) and syllables starting with a stop consonant (Gage, et al, 1998, 2002; Obleser, et al, 2003). In addition, rightward lateralization of both M100 peak latency and response amplitude has been found in the magnetic field response to frequency-modulated (FM) sweeps (König, et al, 2008) and in the tangential component of the N100 electric potential response for white noise and tone stimuli (Hine & Debener, 2007).…”

Section: Introductionmentioning

confidence: 95%

Hemispheric asymmetry in mid and long latency neuromagnetic responses to single clicks

Howard

Poeppel

2009

Hearing Research

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We examine lateralization in the evoked magnetic field response to a click stimulus, observing that lateralization effects previously demonstrated for tones, noise, frequency modulated sweeps and certain syllables are also observed for (acoustically simpler) clicks. These effects include a difference in the peak latency of the M100 component of the evoked field waveform such that the peak consistently appears earlier in the right hemisphere, as well as rightward lateralization of field amplitude during the rise of the M100 component. Our review of previous findings on M100 lateralization, taken together with our data on the click-evoked response, leads to the hypothesis that these lateralization effects are elicited by stimuli containing a sharp sound energy onset or acoustic transition rather than specific types of stimuli. We argue that both the latency and the amplitude lateralization effects have a common origin, namely, hemispheric asymmetry in the amplitude of the magnetic field generated by one or more sources active during the M100 rise. While anatomical asymmetry cannot be excluded as the cause of the amplitude difference, we propose that the difference reflects a rightward asymmetry in the processing of sound energy onsets that potentially underlies the lateralization of several functions.

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