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Cerebral Cortex Advance Access originally published online on March 16, 2005
Cerebral Cortex 2005 15(12):2029-2039; doi:10.1093/cercor/bhi078
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© The Author 2005. Published by Oxford University Press. All rights reserved. For permissions, please e-mail: journals.permissions@oupjournals.org

Right Hemispheric Laterality of Human 40 Hz Auditory Steady-state Responses

B. Ross1, A.T. Herdman1 and C. Pantev2

1 The Rotman Research Institute, Baycrest Centre for Geriatric Care, Toronto, Canada and 2 Institute for Biomagnetism and Biosignalanalysis, Münster University Hospital, Germany

Address correspondence to Bernhard Ross, The Rotman Research Institute, Baycrest Centre for Geriatric Care, 3560 Bathurst Street, Toronto, ON, Canada, M6A 2E1. Email: bernhard.ross{at}ieee.org.

Hemispheric asymmetries during auditory sensory processing were examined using whole-head magnetoencephalographic recordings of auditory evoked responses to monaurally and binaurally presented amplitude-modulated sounds. Laterality indices were calculated for the transient onset responses (P1m and N1m), the transient gamma-band response, the sustained field (SF) and the 40 Hz auditory steady-state response (ASSR). All response components showed laterality toward the hemisphere contralateral to the stimulated ear. In addition, the SF and ASSR showed right hemispheric (RH) dominance. Thus, laterality of sustained response components (SF and ASSR) was distinct from that of transient responses. ASSR and SF are sensitive to stimulus periodicity. Consequently, ASSR and SF likely reflect periodic stimulus attributes and might be relevant for pitch processing based on temporal stimulus regularities. In summary, the results of the present studies demonstrate that asymmetric organization in the cerebral auditory cortex is already established on the level of sensory processing.

Key Words: amplitude modulation • auditory evoked magnetic fields • hemispheric asymmetry • magnetoencephalography • pitch processing


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