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The Journal of Neuroscience, September 14, 2005, 25(37):8518-8527; doi:10.1523/JNEUROSCI.1266-05.2005

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Behavioral/Systems/Cognitive
Human Auditory Cortical Processing of Changes in Interaural Correlation

Maria Chait,¹ David Poeppel,^1,2,3 Alain de Cheveigné,⁵ and Jonathan Z. Simon^1,3,4

¹Neuroscience and Cognitive Science Program and Departments of ²Linguistics, ³Biology, and ⁴Electrical and Computer Engineering, University of Maryland, College Park, Maryland 20742-7505, and ⁵Centre National de la Recherche Scientifique, Unité Mixte de Recherche 8581, Université Paris 5 and École Normale Supérieure, 75230 Paris, France

Sensitivity to the similarity of the acoustic waveforms at the two ears, and specifically to changes in similarity, is crucial to auditory scene analysis and extraction of objects from background. Here, we use the high temporal resolution of magnetoencephalography to investigate the dynamics of cortical processing of changes in interaural correlation, a measure of interaural similarity, and compare them with behavior. Stimuli are interaurally correlated or uncorrelated wideband noise, immediately followed by the same noise with intermediate degrees of interaural correlation. Behaviorally, listeners' sensitivity to changes in interaural correlation is asymmetrical. Listeners are faster and better at detecting transitions from correlated noise than transitions from uncorrelated noise. The cortical response to the change in correlation is characterized by an activation sequence starting from 50 ms after change. The strength of this response parallels behavioral performance: auditory cortical mechanisms are much less sensitive to transitions from uncorrelated noise than from correlated noise. In each case, sensitivity increases with interaural correlation difference. Brain responses to transitions from uncorrelated noise lag those from correlated noise by 80 ms, which may be the neural correlate of the observed behavioral response time differences. Importantly, we demonstrate differences in location and time course of neural processing: transitions from correlated noise are processed by a distinct neural population, and with greater speed, than transitions from uncorrelated noise.

Key words: auditory-evoked response; magnetoencephalography; auditory cortex; psychophysics; binaural system; binaural sluggishness; change detection

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Received April 1, 2005; revised August 1, 2005; accepted August 4, 2005.

This article has been cited by other articles:

				B. Ross A Novel Type of Auditory Responses: Temporal Dynamics of 40-Hz Steady-State Responses Induced by Changes in Sound Localization J Neurophysiol, September 1, 2008; 100(3): 1265 - 1277. [Abstract] [Full Text] [PDF]

				M. Chait, D. Poeppel, and J. Z. Simon Stimulus Context Affects Auditory Cortical Responses to Changes in Interaural Correlation J Neurophysiol, July 1, 2007; 98(1): 224 - 231. [Abstract] [Full Text] [PDF]

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