Abstract
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.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 41-52 |
| Number of pages | 12 |
| Journal | Hearing Research |
| Volume | 257 |
| Issue number | 1-2 |
| DOIs | |
| State | Published - Nov 2009 |
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Keywords
- Auditory
- Evoked field
- Lateralization
- M100
- MEG
- N1m
ASJC Scopus subject areas
- Sensory Systems
Cite this
Hemispheric asymmetry in mid and long latency neuromagnetic responses to single clicks. / Howard, Mary F.; Poeppel, David.
In: Hearing Research, Vol. 257, No. 1-2, 11.2009, p. 41-52.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Hemispheric asymmetry in mid and long latency neuromagnetic responses to single clicks
AU - Howard, Mary F.
AU - Poeppel, David
PY - 2009/11
Y1 - 2009/11
N2 - 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.
AB - 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.
KW - Auditory
KW - Evoked field
KW - Lateralization
KW - M100
KW - MEG
KW - N1m
UR - http://www.scopus.com/inward/record.url?scp=70349422128&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=70349422128&partnerID=8YFLogxK
U2 - 10.1016/j.heares.2009.07.010
DO - 10.1016/j.heares.2009.07.010
M3 - Article
VL - 257
SP - 41
EP - 52
JO - Hearing Research
JF - Hearing Research
SN - 0378-5955
IS - 1-2
ER -