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Does semantic context benefit speech understanding through "top-down" processes? Evidence from time-resolved sparse

Matthew H Davis1, Michael A Ford, Ferath Kherif

  • 1MRC Cognition and Brain Sciences Unit, 15 Chaucer Road, Cambridge, CB2 7EF, UK. matt.davis@mrc-cbu.cam.ac.uk

Journal of Cognitive Neuroscience
|July 13, 2011
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Summary
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Understanding degraded speech relies on sentence meaning, but brain activity suggests a bottom-up process. Neural signals flow from auditory regions to frontal areas, challenging the top-down theory for speech perception.

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Area of Science:

  • Neuroscience
  • Auditory Perception
  • Cognitive Science

Background:

  • Speech intelligibility is enhanced for semantically coherent sentences compared to anomalous ones.
  • This improvement is often attributed to "top-down" neural processes, where higher-level semantic information influences lower-level perception.
  • The exact neural mechanisms underlying this phenomenon require further investigation.

Purpose of the Study:

  • To investigate the neural mechanisms underlying the intelligibility benefits of semantic coherence in degraded speech.
  • To differentiate between "top-down" (feedback) and "bottom-up" (feedforward) models of speech processing using neuroimaging.
  • To examine the temporal dynamics of brain activity in response to coherent versus anomalous sentences under varying noise conditions.

Main Methods:

  • Utilized time-resolved sparse functional Magnetic Resonance Imaging (fMRI) to measure brain activity.
  • Participants listened to coherent and anomalous sentences embedded in speech-envelope/spectrum noise at different signal-to-noise ratios (SNRs).
  • Analyzed the timing and location of Blood-Oxygen-Level-Dependent (BOLD) responses.

Main Results:

  • Hierarchical organization was observed, with earlier BOLD responses in posterior superior temporal gyrus (peri-auditory regions) compared to more distant temporal and frontal regions for intelligible speech.
  • Interactions between sentence content and SNR were found in the superior temporal gyrus.
  • Crucially, prefrontal regions showed later responses than auditory/perceptual regions, even with content-driven effects in auditory areas.

Conclusions:

  • The observed neural response timing, with prefrontal activation following auditory processing, is more consistent with a feedforward or "bottom-up" model.
  • This suggests that information flows from lower-level perceptual areas to higher-level frontal regions.
  • While semantic content influences speech perception, the neural evidence does not necessitate "top-down" processing for degraded speech intelligibility.