COGNITIVE NEUROSCIENCE AND NEUROPSYCHOLOGYHemispheric processing of duration changes in speech and non-speech soundsTakegata, Rika1 2 CA; Nakagawa, Seiji2; Tonoike, Mitsuo2; Näätänen, Risto1Author Information 1Cognitive Brain Research Unit, Department of Psychology, P.O. Box 9, FI-00014, University of Helsinki, and Helsinki Brain Research Centre, Helsinki, Finland 2Institute for Human Science and Biomedical Engineering, National Institute of Advanced Industrial Sciences and Technology (AIST), 1-8-31 Midorigaoka, Ikeda, Osaka 563-8577, Japan CA,1Corresponding Author: firstname.lastname@example.org Received 28 April 2004; accepted 25 May 2004 NeuroReport: July 19th, 2004 - Volume 15 - Issue 10 - p 1683-1686 doi: 10.1097/01.wnr.0000134929.04561.64 Buy SDC Metrics Abstract Sound duration conveys phonemic information in some languages. The present study, using magnetoencephalography (MEG), examined whether the hemispheric activation associated with the processing of duration is different between speech and non-speech sounds in subjects whose native language uses duration as a phonemic cue. The magnetic mismatch negativity (MMNm) response was recorded for equal-duration decrements in vowel, sinusoidal, and spectrally rich complex sounds. Although the MMNm responses to duration changes were predominant in the right hemisphere, the distribution of this response for the vowel stimuli was significantly displaced leftward compared with that for the other two types of stimuli. The results suggest that the hemispheric distribution of the MMNm response to duration change depends on the linguistic relevance of the change. © 2004 Lippincott Williams & Wilkins, Inc.