Comodulation masking release and the role of wideband inhibition in the cochlear nucleus

Winter, Ian M.; Neuert, Veronika; Verhey, Jesko L.

doi:10.1007/0-387-27045-0_40

Cited by 2 publications

(1 citation statement)

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“…This asymmetry suggests that the modulated target is more likely to "pop out" of the background of unmodulated maskers than the reverse, making detection of a modulated target robust to the addition of interferers. In comodulation masking release ͑CMR͒ studies, adding off-target-frequency components that are modulated identically with the on-frequency masker improves the detectability of an unmodulated target ͑Hall et van de Par and Kohlrausch, 1998;Winter et al, 2004͒. However, we know of no studies reporting a corresponding benefit of increasing masker bandwidth when the target, rather than the masker, is modulated, so it is possible that there is a perceptual asymmetry between modulating the target versus modulating the masker in such situations, as well.…”

Section: Introductionmentioning

confidence: 89%

Influences of modulation and spatial separation on detection of a masked broadband target

Kopčo

Shinn‐Cunningham

2008

The Journal of the Acoustical Society of America

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Experiments explored the influence of amplitude modulation and spatial separation on detectability of a broadband noise target masked by an independent broadband noise. Thresholds were measured for all combinations of six spatial configurations of target and masker and five modulation conditions. Masker level was either fixed ͑Experiment 1͒ or roved between intervals within a trial to reduce the utility of overall intensity as a cue ͑Experiment 2͒. After accounting for acoustic changes, thresholds depended on whether a target and a masker were colocated or spatially separated, but not on the exact spatial configuration. Moreover, spatial unmasking exceeded that predicted by better-ear acoustics only when modulation cues for detection were weak. Roving increased the colocated but not the spatially separated thresholds, resulting in an increase in spatial release from masking. Differences in both how performance changed over time and the influence of spatial separation support the idea that the cues underlying performance depend on the modulation characteristics of the target and masker. Analysis suggests that detection is based on overall intensity when target and masker modulation and spatial cues are the same, on spatial attributes when sources are separated and modulation provides no target glimpses, and on modulation discrimination in the remaining conditions.

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Section: Introductionmentioning

confidence: 89%

Influences of modulation and spatial separation on detection of a masked broadband target

Kopčo

Shinn‐Cunningham

2008

The Journal of the Acoustical Society of America

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β- And γ-band EEG power predicts illusory auditory continuity perception

Vinnik

Itskov

Balaban

2012

Journal of Neurophysiology

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Because acoustic landscapes are complex and rapidly changing, auditory systems have evolved mechanisms that permit rapid detection of novel sounds, sound source segregation, and perceptual restoration of sounds obscured by noise. Perceptual restoration is particularly important in noisy environments because it allows organisms to track sounds over time even when they are masked. The continuity illusion is a striking example of perceptual restoration with sounds perceived as intact even when parts of them have been replaced by gaps and rendered inaudible by being masked by an extraneous sound. The mechanisms of auditory filling-in are complex and are currently not well-understood. The present study used the high temporal resolution of EEG to examine brain activity related to continuity illusion perception. Masking noise loudness was adjusted individually for each subject so that physically identical sounds on some trials elicited a continuity illusion (failure to detect a gap in a sound) and on other trials resulted in correct gap detection. This design ensured that any measurable differences in brain activity would be due to perceptual differences rather than physical differences among stimuli. We found that baseline activity recorded immediately before presentation of the stimulus significantly predicted the occurrence of the continuity illusion in 10 out of 14 participants based on power differences in γ-band EEG (34-80 Hz). Across all participants, power in the β and γ (12- to 80-Hz range) was informative about the subsequent perceptual decision. These data suggest that a subject's baseline brain state influences the strength of continuity illusions.

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Comodulation masking release and the role of wideband inhibition in the cochlear nucleus

Cited by 2 publications

References 10 publications

Influences of modulation and spatial separation on detection of a masked broadband target

Influences of modulation and spatial separation on detection of a masked broadband target

β- And γ-band EEG power predicts illusory auditory continuity perception

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