Interaural correlation discrimination: II. Relation to binaural unmasking

Durlach, N. I.; Gabriel, K.J.; Colburn, H. Steven; Trahiotis, Constantine

doi:10.1121/1.393681

Cited by 75 publications

(51 citation statements)

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“…Binaural unmasking is fundamental to listeners' ability to operate in noisy, multisource environments and has been widely investigated both electrophysiologically (Jiang et al, 1997a,b;Palmer et al, 2000) and behaviorally (for review, see Colburn, 1995). This phenomenon may be mediated by the ability of the auditory system to detect decreases (in case of inverting the target) or increases (in case of inverting the noise) in interaural coherence resulting from the addition of the target (Durlach et al, 1986;Palmer et al, 1999). Therefore, the investigation of the neural mechanisms that are sensitive to interaural similarity is particularly informative in the study of how listeners analyze the auditory scene and react to changes in the order of the environment.…”

Section: Introductionmentioning

confidence: 99%

Human Auditory Cortical Processing of Changes in Interaural Correlation

Chait¹,

Poeppel²,

Cheveigné³

et al. 2005

J. Neurosci.

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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 ϳ50 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 ϳ80 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.

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Section: Introductionmentioning

confidence: 99%

Human Auditory Cortical Processing of Changes in Interaural Correlation

Chait¹,

Poeppel²,

Cheveigné³

et al. 2005

J. Neurosci.

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“…as was also derived by others, e.g., Durlach et al ͑1986͒. The relative power of the masker, M , and the signal, S, is the only determining factor for the correlation; other statistical properties of M and S have no effect.…”

Section: ͑9͒mentioning

confidence: 55%

“…In the typical condition of an in-phase masker combined with an out-of-phase signal (M 0 S ), 1 this leads to a very simple relation between the interaural waveform correlation and the relative intensity of masker and signal ͑cf. Durlach et al, 1986͒. This correlation measure is, however, of little relevance for experiments that use highfrequency stimuli.…”

Section: Introductionmentioning

confidence: 99%

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Analytical expressions for the envelope correlation of certain narrow-band stimuli

Par¹,

Kohlrausch²

1995

The Journal of the Acoustical Society of America

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Analytical solutions are presented for the correlation between the envelopes of certain narrow-band stimuli which are typically used in binaural research. These stimuli are either the sum of an in-phase masker and an out-of-phase signal, or they are two partially correlated noises. Because an envelope has a nonzero mean, the solutions differ depending on whether the envelope correlation is expressed as the normalized cross correlation or as the normalized cross covariance ͑Pearson product-moment correlation͒. The envelope correlation depends on the statistics of the masker and the signal whereas the waveform correlation depends on neither. This influence only disappears for the normalized envelope cross correlation provided that the correlation is close to one. In this case, the normalized envelope cross correlation is equal to the square root of the waveform correlation. The results for two partially correlated noise bands are also of relevance for experiments dealing with monaural envelope discrimination and comodulation masking release.

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“…Interaural correlation has been implicated in binaural unmasking [7,16]. This noise cancellation by contralateral inhibition appears located in the auditory brainstem [5,6,17], and there is evidence to suggest it may operate in frequency subbands [7,17,18].…”

Section: Binaural Signal Processingmentioning

confidence: 99%

Sub-band adaptive speech enhancement for hearing aids

Campbell¹

Proceeding of Fourth International Conference on Spoken Language Processing. ICSLP '96

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Interaural correlation discrimination: II. Relation to binaural unmasking

Cited by 75 publications

References 0 publications

Human Auditory Cortical Processing of Changes in Interaural Correlation

Human Auditory Cortical Processing of Changes in Interaural Correlation

Analytical expressions for the envelope correlation of certain narrow-band stimuli

Sub-band adaptive speech enhancement for hearing aids

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