Mismatch negativity elicited by the moving sound images not differentiated behaviorally

Abstract

Event Abstract Back to Event Mismatch negativity elicited by the moving sound images not differentiated behaviorally Lidia Shestopalova1* and Yu A. Vasilenko1 1 Pavlov Institute of Physiology, Russian Academy of Sciences, Russia The mismatch negativity (MMN) has been usually regarded as an objective index of the discrimination accuracy for the different acoustic dimensions, including spatial sound features. The MMN amplitude was shown to correlate with the magnitude of spatial deviance of stationary sound source. In a few studies of MMNs elicited by acoustic differences not differentiated behaviorally, the spatial stimulus changes were never employed. We expected that the auditory motion could be an appropriate acoustic feature to study the correlation of MMN with the behavioral performance. The intent of the present study was to compare the spatial discrimination of moving sound images measured by means of both MMN and psychoacoustic procedure. The apparent auditory motion was simulated through manipulating interaural time differences (ITDs). The study was conducted in two experiments. Experiment 1 contrasted the MMNs elicited by two different deviant stimuli against the same standard. The standard was the stationary noise burst located at the head midline. The deviant noise burst either moved gradually to the left/right from the head midline or shifted abruptly by the same azimuth. The only acoustic difference between deviant stimuli was the ITD time pattern represented by either linear or step function. Both deviants were discriminated behaviorally from standards by 100% correct. One could expect that they should elicit similar MMNs but the MMN evoked by abrupt sound shift appeared greater and earlier. Experiment 2 explored the MMN elicited by the abrupt sound shift taken as deviant against gradual sound motion taken as standard. The discrimination of these stimuli tested using a two-alternative forced-choice procedure was far below the threshold level: the stimuli simulating gradual and abrupt sound movement were not identified by any of the subjects. Nevertheless, significant MMNs were obtained. These findings are in line with the point of view that MMN should not be considered as a direct index of behavioral discrimination accuracy. A possible reason why MMN may be dissociated from the behavioral performance of auditory motion is that the earlier cortical stages of sound processing reflected by MMN are probably less sluggish than higher levels of auditory perception. This study was supported by the grants NS-3866.2008.4 and RFBR 08-04-00006. Conference: MMN 09 Fifth Conference on Mismatch Negativity (MMN) and its Clinical and Scientific Applications, Budapest, Hungary, 4 Apr - 7 Apr, 2009. Presentation Type: Poster Presentation Topic: Poster Presentations Citation: Shestopalova L and Vasilenko YA (2009). Mismatch negativity elicited by the moving sound images not differentiated behaviorally. Conference Abstract: MMN 09 Fifth Conference on Mismatch Negativity (MMN) and its Clinical and Scientific Applications. doi: 10.3389/conf.neuro.09.2009.05.074 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: 25 Mar 2009; Published Online: 25 Mar 2009. * Correspondence: Lidia Shestopalova, Pavlov Institute of Physiology, Russian Academy of Sciences, St.Petersburg, Russia, slb@infran.ru 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 Lidia Shestopalova Yu A Vasilenko Google Lidia Shestopalova Yu A Vasilenko Google Scholar Lidia Shestopalova Yu A Vasilenko PubMed Lidia Shestopalova Yu A Vasilenko 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.