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Stimulus-driven and behavior-driving activity along the cortical auditory hierarchy.

Kirill V Nourski1, Mitchell Steinschneider2, Ariane E Rhone3

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Summary

This study used intracranial electroencephalography (iEEG) to map brain activity during speech perception. Behavior-related neural activity was found primarily in the prefrontal cortex, distinct from stimulus-driven auditory processing.

Keywords:
High gammaSemantic processingSpeechiEEG

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Speech Processing

Background:

  • Auditory cortex processes acoustic and phonetic speech features.
  • Higher-level processing involves ventral/dorsal streams and prefrontal cortex for perception and action.

Purpose of the Study:

  • To clarify the cortical location and emergence of neural activity driving behavioral events in speech perception.
  • To differentiate stimulus-driven from behavior-driven neural patterns.

Main Methods:

  • Intracranial electroencephalography (iEEG) in epilepsy patients.
  • Presentation of monosyllabic words and a button-press task for semantic targets.
  • Analysis of high gamma activity time-locked to stimulus onset and motor response.

Main Results:

  • Stimulus-related activity was widespread in the auditory hierarchy and sensorimotor cortex.
  • Behavior-related activity was concentrated in prefrontal cortex, with some in anterior temporal and parieto-occipital areas.
  • Hemispheric asymmetries observed: right sensorimotor for stimulus-related, left prefrontal for behavior-related activity.

Conclusions:

  • Neural activity driving behavior in speech perception is sparsely represented, primarily in prefrontal cortex.
  • Faster responses correlate with increased stimulus-locked activity in auditory, prefrontal, and premotor areas.
  • Findings illuminate the cortical organization of sensory processing and behavior-timed neural events in speech perception.