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Related Concept Videos

Auditory Pathway01:15

Auditory Pathway

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 the...

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Interaction between Phonological and Semantic Processes in Visual Word Recognition using Electrophysiology
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Cortical spatio-temporal dynamics underlying phonological target detection in humans.

Edward F Chang1, Erik Edwards, Srikantan S Nagarajan

  • 1Department of Neurological Surgery, University of California, San Francisco, San Francisco, CA 94143, USA. ChangEd@neurosurg.ucsf.edu

Journal of Cognitive Neuroscience
|May 15, 2010
PubMed
Summary

Detecting target sounds involves rapid brain processing. High gamma activity progresses from sensory areas to the prefrontal cortex, guiding motor responses for goal-directed behavior.

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Last Updated: Jun 13, 2026

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05:38

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Published on: June 29, 2021

Infant Auditory Processing and Event-related Brain Oscillations
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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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Mapping Cortical Dynamics Using Simultaneous MEG/EEG and Anatomically-constrained Minimum-norm Estimates: an Auditory Attention Example

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Computational Neuroscience

Background:

  • Selective processing of task-relevant stimuli is crucial for goal-directed behavior.
  • Understanding the neural dynamics of target detection is essential for cognitive science.

Purpose of the Study:

  • To investigate the spatio-temporal dynamics of cortical activation during a phonological target detection task.
  • To elucidate the neural mechanisms underlying selective stimulus processing and response guidance.

Main Methods:

  • Electrocorticography (ECoG) was used to record brain activity.
  • High gamma (HG, 70-200 Hz) activity was analyzed during a syllable detection task.

Main Results:

  • A temporal progression of HG activity was observed across the lateral hemisphere within 1 second.
  • Early sensory processing in the superior temporal gyrus (STG) and speech motor cortex preceded sequential processing in the prefrontal cortex (PFC).
  • STG showed enhanced activation for targets, while PFC was highly selective to targets, indicating distinct roles in sensory gain and response guidance.

Conclusions:

  • Target detection is a progressive process involving large-scale, rapid parallel and serial processing.
  • This process engages sensory, cognitive, and motor structures to support goal-directed behavior.
  • The findings reveal distinct neural mechanisms for sensory processing and response selection in target detection.