Journal
NEUROIMAGE
Volume 60, Issue 2, Pages 1490-1502Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.neuroimage.2012.01.035
Keywords
fMRI; Primary auditory cortex; Speech perception; Predictive coding; Top-down influences; Superior temporal sulcus; Premotor cortex; Inferior frontal gyrus; Feedback connections
Funding
- Medical Research Council [MC_U105580446] Funding Source: researchfish
- MRC [MC_U105580446] Funding Source: UKRI
- Medical Research Council [MC_U105580446] Funding Source: Medline
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Feedback connections among auditory cortical regions may play an important functional role in processing naturalistic speech, which is typically considered a problem solved through serial feed-forward processing stages. Here, we used fMRI to investigate whether activity within primary auditory cortex (PAC) is sensitive to the perceived clarity of degraded sentences. A region-of-interest analysis using probabilistic cytoarchitectonic maps of PAC revealed a modulation of activity, in the most primary-like subregion (area Te1.0). related to the intelligibility of naturalistic speech stimuli that cannot be driven by stimulus differences. Importantly, this effect was unique to those conditions accompanied by a perceptual increase in clarity. Connectivity analyses suggested sources of input to PAC are higher-order temporal, frontal and motor regions. These findings are incompatible with feed-forward models of speech perception, and suggest that this problem belongs amongst modern perceptual frameworks in which the brain actively predicts sensory input, rather than just passively receiving it. Crown Copyright (c) 2012 Published by Elsevier Inc. All rights reserved.
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