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Related Concept Videos

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Auditory pathways constitute the complex neural circuits responsible for transmitting and interpreting auditory information from the peripheral auditory system to the brain. Sound waves are initially captured by the outer ear, funneled through the ear canal, and reach the tympanic membrane (eardrum). These vibrations are transmitted via the middle ear's ossicles to the inner ear's cochlea.
When viewed cross-sectionally, the cochlea reveals the scala vestibuli and scala tympani flanking...
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When we hear a sound, our nervous system is detecting sound waves—pressure waves of mechanical energy traveling through a medium. The frequency of the wave is perceived as pitch, while the amplitude is perceived as loudness.
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Mapping Cortical Dynamics Using Simultaneous MEG/EEG and Anatomically-constrained Minimum-norm Estimates: an Auditory Attention Example
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Tracking cortical entrainment in neural activity: auditory processes in human temporal cortex.

Andrew Thwaites1, Ian Nimmo-Smith2, Elisabeth Fonteneau1

  • 1Neurolex Group, Department of Psychology, University of Cambridge Cambridge, UK ; MRC Cognition and Brain Sciences Unit Cambridge, UK.

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|February 26, 2015
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Summary
This summary is machine-generated.

Cognitive neuroscience research reveals how the brain processes speech loudness. More realistic models predict neural activity tracking loudness down the superior temporal sulcus (STS), guiding speech analysis.

Keywords:
MNE source spacefundamental frequency contourinformation encodingmagnetoencephalographymodel expressionneural computationspeech envelope

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Area of Science:

  • Cognitive Neuroscience
  • Auditory Perception
  • Neuroimaging

Background:

  • Understanding neural encoding of sensory information is key in cognitive neuroscience.
  • Auditory models of loudness perception predict cortical activity during speech perception.

Purpose of the Study:

  • To investigate neural correlates of loudness perception in speech using computational models and electrophysiological recordings.
  • To differentiate the neural processing of loudness from fundamental frequency (F0) in speech.

Main Methods:

  • Utilized two auditory loudness models (loudness-sones and loudness-phons) to predict loudness contours for 480 isolated words.
  • Searched whole-brain electro- and magneto-encephalographic (EMEG) data for neural evidence of loudness processing.
  • Extended analysis to identify neural sensitivity to the fundamental frequency (F0) of speech.

Main Results:

  • A bilateral sequence of loudness processing was identified, originating in auditory cortex (~80 ms) and extending down the superior temporal sulcus (STS) (230–330 ms), consistent with the loudness-sones model.
  • A distinct bilateral F0 processing region was found in auditory cortex (~90 ms), without subsequent STS involvement.
  • Loudness processing showed a distinct pathway compared to F0 processing.

Conclusions:

  • Loudness information appears to guide speech stream analysis beyond auditory cortex, down the STS towards the temporal pole.
  • The findings highlight the differential neural pathways for processing acoustic features like loudness and F0 in speech.
  • The study validates the utility of psychophysiologically realistic models in predicting neural activity related to auditory perception.