Distinct neural systems recruited when speech production is modulated by different masking sounds

Meekings, S., Evans, S., Lavan, N., Boebinger, D., Krieger-Redwood, K., Cooke, M. and Scott, S.K. 2016. Distinct neural systems recruited when speech production is modulated by different masking sounds. Journal of the Acoustical Society of America. 140 (1), pp. 8-19. doi:10.1121/1.4948587

TitleDistinct neural systems recruited when speech production is modulated by different masking sounds
AuthorsMeekings, S., Evans, S., Lavan, N., Boebinger, D., Krieger-Redwood, K., Cooke, M. and Scott, S.K.
Abstract

When talkers speak in masking sounds, their speech undergoes a variety of acoustic and phonetic changes. These changes are known collectively as the Lombard effect. Most behavioural research and neuroimaging research in this area has concentrated on the effect of energetic maskers such as white noise on Lombard speech. Previous fMRI studies have argued that neural responses to speaking in noise are driven by the quality of auditory feedback—that is, the audibility of the speaker’s voice over the masker. However, we also frequently produce speech in the presence of informational maskers such as another talker. Here, speakers read sentences over a range of maskers varying in their informational and energetic content: speech, rotated speech, speech modulated noise, and white noise. Subjects also spoke in quiet and listened to the maskers without speaking. When subjects spoke in masking sounds, their vocal intensity increased in line with the energetic content of the masker. However, the opposite pattern was found neurally. In the superior temporal gyrus, activation was most strongly associated with increases in informational, rather than energetic, masking. This suggests that the neural activations associated with speaking in noise are more complex than a simple feedback response.

JournalJournal of the Acoustical Society of America
Journal citation140 (1), pp. 8-19
ISSN0001-4966
Year2016
PublisherAcoustical Society of America
Publisher's version1.4948587.pdf
Digital Object Identifier (DOI)doi:10.1121/1.4948587
Publication dates
Published05 Jul 2016
LicenseCC BY 4.0

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