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Title: Peripheral and central mechanisms for comodulation masking release
Author: Goldman, S. A.
Awarding Body: University of Cambridge
Current Institution: University of Cambridge
Date of Award: 2011
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This dissertation examines a variety of peripheral (within-channel) and central (across-channel) cues to comodulation masking release (CMR) and their relative contributions under circumstances in which multiple cues may be available to the auditory system. The first study compared detection performance for a single flanking band (FB) of noise centred close to an on-frequency band (OFB) of noise with that of a pair of otherwise equivalent, symmetrically spaced FBs. The results do not support the idea that there are additional within-channel cues that are available for a single FB than for a FB pair. Simulations suggest that within-channel envelope and TFS cues may be more salient for a FB pair than for a single FB. The second study examined the effect of disrupting within-channel cues based upon envelope beats at the output of an auditory filter centred at the signal frequency, using a method called ‘OFB reversal’. This manipulation consistently reduced CMR for proximal FB pairs – but not for a single FB or distal FB pair, or when the FBs were presented in the opposite ear to the signal plus OFB – across a range of signal frequencies and for continuous and gated masker presentation. The third study extended the second by using an auditory-grouping manipulation to disrupt across-channel cues, to determine the relative contribution of within- and across-channel cues to CMR for proximally spaced noise bands. The results support the notion of a complex interplay between peripheral and central mechanisms for signal detection in the presence of modulated noise and highlight the importance of experimental design in CMR experiments.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available