Dichotic stimulation accentuates hemispheric asymmetry in pre-attentive change detection for different acoustic features

Abstract

Event Abstract Back to Event Dichotic stimulation accentuates hemispheric asymmetry in pre-attentive change detection for different acoustic features Rika Takegata1*, C. Jacquier2, S. Pakarinen1, T. Kujala1 and R. Näätänen1, 3 1 University of Helsinki, Finland 2 CNRS and Université Louis Lumière Lyon 2, France 3 University of Tartu, Estonia Introduction: The left and right hemispheres show functional asymmetries in the processing of acoustic (e.g., temporal) features that are crucial for speech perception. Anomalous asymmetry for a certain acoustic feature may provide a clue to identify the source of deteriorated speech perception. The current study examined the effects of the manner (dichotic vs. monaural) and the ear (left vs. right) of stimulation on the mismatch negativity (MMN) for speech and non-speech sounds, pursuing a fast and reliable method to examine the hemispheric asymmetry at pre-attentive level. Methods: Speech and non-speech stimulus sequences each comprised a frequent sound (standard: S) and four types of infrequent sounds (deviant: D) that differed from the standard in duration, frequency, intensity, or vowel (or an equivalent temporal-spectral change in non-speech stimuli). The standard and the deviant stimuli appeared alternately (e.g., S Dfrequency S DDuration S…), according to the fast paradigm developed by Näätänen et al. (2004, Clin Neurophysiol). In dichotic condition, speech and non-speech stimuli were presented alternately, with speech stimuli to the right ear and non-speech stimuli to the left ear. The stimulus-ear relation was reversed for half of the experiment. In monaural condition, either the speech or non-speech stimuli alone presented to a single ear. Subjects watched silent films with subtitles and ignore the stimulus sounds. Results and Discussion: The ear of stimulation had a significant effect on the MMN amplitude for the speech and non-speech stimuli in the dichotic condition whereas it had no effect in the monaural condition (Fig. 1). The results indicated that dichotic stimulation accentuated differential processing of speech vs. non-speech sounds even at preattentive level. The observed ear effects may reflect asymmetric hemispheric contributions for the processing of different acoustic features. tn_pic1 pic Conference: 10th International Conference on Cognitive Neuroscience, Bodrum, Turkey, 1 Sep - 5 Sep, 2008. Presentation Type: Oral Presentation Topic: Change Detection Citation: Takegata R, Jacquier C, Pakarinen S, Kujala T and Näätänen R (2008). Dichotic stimulation accentuates hemispheric asymmetry in pre-attentive change detection for different acoustic features. Conference Abstract: 10th International Conference on Cognitive Neuroscience. doi: 10.3389/conf.neuro.09.2009.01.156 Copyright: The abstracts in this collection have not been subject to any Frontiers peer review or checks, and are not endorsed by Frontiers. They are made available through the Frontiers publishing platform as a service to conference organizers and presenters. The copyright in the individual abstracts is owned by the author of each abstract or his/her employer unless otherwise stated. Each abstract, as well as the collection of abstracts, are published under a Creative Commons CC-BY 4.0 (attribution) licence (https://creativecommons.org/licenses/by/4.0/) and may thus be reproduced, translated, adapted and be the subject of derivative works provided the authors and Frontiers are attributed. For Frontiers’ terms and conditions please see https://www.frontiersin.org/legal/terms-and-conditions. Received: 05 Dec 2008; Published Online: 05 Dec 2008. * Correspondence: Rika Takegata, University of Helsinki, Helsinki, Finland, rika.takegata@helsinki.fi Login Required This action requires you to be registered with Frontiers and logged in. To register or login click here. Abstract Info Abstract The Authors in Frontiers Rika Takegata C. Jacquier S. Pakarinen T. Kujala R. Näätänen Google Rika Takegata C. Jacquier S. Pakarinen T. Kujala R. Näätänen Google Scholar Rika Takegata C. Jacquier S. Pakarinen T. Kujala R. Näätänen PubMed Rika Takegata C. Jacquier S. Pakarinen T. Kujala R. Näätänen Related Article in Frontiers Google Scholar PubMed Abstract Close Back to top Javascript is disabled. Please enable Javascript in your browser settings in order to see all the content on this page.