PMID- 17535555
OWN - NLM
STAT- MEDLINE
DCOM- 20071206
LR  - 20191210
IS  - 0161-6412 (Print)
IS  - 0161-6412 (Linking)
VI  - 29
IP  - 5
DP  - 2007 Jul
TI  - Side of the stimulated ear influences the hemispheric balance in coding tonal 
      stimuli.
PG  - 517-22
AB  - OBJECTIVE: To evaluate whether the side of stimulated ear affects the hemispheric 
      asymmetry of auditory evoked cortical activations. METHODS: Using a whole-head 
      neuromagnetometer, we recorded neuromagnetic approximately 100 ms responses 
      (N100m) in 21 healthy right-handers to 100 ms 1 kHz tones delivered alternatively 
      to left and right ear. RESULTS: Although the peak latencies of N100m were shorter 
      in contralateral than in ipsilateral hemisphere, the difference was significant 
      only for the left ear stimulation. Based on the relative N100m amplitudes across 
      hemispheres, the laterality evaluation showed a rightward predominance of N100m 
      activation to tone stimuli, but the lateralization toward the right hemisphere 
      was more apparent by the left than by the right ear stimulation (laterality 
      index: -0.27 versus -0.10, p=0.008). Within the right hemisphere, the N100m was 
      2-4 mm more posterior for left ear than for right ear stimulation. CONCLUSIONS: 
      The hemispheric asymmetry in auditory processing depends on the side of the 
      stimulated ear. The more anterior localization of right N100m responses to 
      ipsilateral than to contralateral ear stimulation suggests that there might be 
      differential neuronal populations in the right hemisphere for processing 
      spatially different auditory inputs.
FAU - Yu, Hsiang-Yu
AU  - Yu HY
AD  - Department of Neurology, National Yang-Ming University, Taipei, Taiwan.
FAU - Chen, Jen-Tse
AU  - Chen JT
FAU - Wu, Zin-An
AU  - Wu ZA
FAU - Yeh, Tzu-Chen
AU  - Yeh TC
FAU - Ho, Low-Tone
AU  - Ho LT
FAU - Lin, Yung-Yang
AU  - Lin YY
LA  - eng
PT  - Evaluation Study
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
PL  - England
TA  - Neurol Res
JT  - Neurological research
JID - 7905298
SB  - IM
MH  - Acoustic Stimulation/methods
MH  - Adolescent
MH  - Adult
MH  - Audiometry, Pure-Tone/methods
MH  - Auditory Perception/*physiology
MH  - *Brain Mapping
MH  - Dominance, Cerebral/physiology/*radiation effects
MH  - *Ear/radiation effects
MH  - Electroencephalography
MH  - Evoked Potentials, Auditory/*physiology
MH  - Female
MH  - Humans
MH  - Magnetoencephalography
MH  - Male
MH  - Reaction Time/physiology
EDAT- 2007/05/31 09:00
MHDA- 2007/12/07 09:00
CRDT- 2007/05/31 09:00
PHST- 2007/05/31 09:00 [pubmed]
PHST- 2007/12/07 09:00 [medline]
PHST- 2007/05/31 09:00 [entrez]
AID - 10.1179/016164107X164157 [doi]
PST - ppublish
SO  - Neurol Res. 2007 Jul;29(5):517-22. doi: 10.1179/016164107X164157.