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The neural processing of masked speech: evidence for different mechanisms in the left and right temporal lobes

The neural processing of masked speech: evidence for different mechanisms in the left and right temporal lobes

Scott, Sophie K., Rosen, Stuart, Beaman, C. Philip, Davis, Josh P. ORCID: 0000-0003-0017-7159 and Wise, Richard J.S. (2009) The neural processing of masked speech: evidence for different mechanisms in the left and right temporal lobes. Journal of the Acoustical Society of America, 125 (3):1737. ISSN 0001-4966 (Print), 1520-8524 (Online) (doi:https://doi.org/10.1121/1.3050255)

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Abstract

It has been previously demonstrated that extensive activation in the dorsolateral temporal lobes associated with masking a speech target with a speech masker, consistent with the hypothesis that competition for central auditory processes is an important factor in informational masking. Here, masking from speech and two additional maskers derived from the original speech were investigated. One of these is spectrally rotated speech, which is unintelligible and has a similar (inverted) spectrotemporal profile to speech. The authors also controlled for the possibility of “glimpsing” of the target signal during modulated masking sounds by using speech-modulated noise as a masker in a baseline condition. Functional imaging results reveal that masking speech with speech leads to bilateral superior temporal gyrus (STG) activation relative to a speech-in-noise baseline, while masking speech with spectrally rotated speech leads solely to right STG activation relative to the baseline. This result is discussed in terms of hemispheric asymmetries for speech perception, and interpreted as showing that masking effects can arise through two parallel neural systems, in the left and right temporal lobes. This has implications for the competition for resources caused by speech and rotated speech maskers, and may illuminate some of the mechanisms involved in informational masking.

Item Type: Article
Uncontrolled Keywords: response to sounds, acoustical properties, amplitude modulation, auditory system, intonation, speech perception, speech processing systems, linear filters, speech communication, electroacoustics
Subjects: B Philosophy. Psychology. Religion > BF Psychology
Faculty / Department / Research Group: Faculty of Education, Health & Human Sciences
Faculty of Education, Health & Human Sciences > Applied Psychology Research Group
Faculty of Education, Health & Human Sciences > Department of Psychology, Social Work & Counselling
Last Modified: 05 Nov 2019 11:05
Selected for GREAT 2016: None
Selected for GREAT 2017: None
Selected for GREAT 2018: None
Selected for GREAT 2019: None
URI: http://gala.gre.ac.uk/id/eprint/25942

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