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Neural circuits in nonhuman primates (NHP) show how amplitude-modulation (AM) encoding changes across the auditory cortex. Enhanced temporal encoding in the left hemisphere originates in supragranular layers.

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Area of Science:

  • Neuroscience
  • Auditory Neuroscience
  • Computational Neuroscience

Background:

  • Amplitude-modulation (AM) encoding is crucial for complex sound perception.
  • Auditory pathway shows hierarchical decrease in AM temporal precision.
  • Left hemisphere exhibits enhanced temporal encoding compared to the right in humans and nonhuman primates (NHP).

Purpose of the Study:

  • Investigate AM encoding across cortical layers and hemispheres in NHP auditory cortex (AC).
  • Identify circuit mechanisms underlying AM encoding transformations.
  • Characterize AM encoding in core and parabelt AC.

Main Methods:

  • Recorded electrophysiological activity in awake NHPs using linear array multielectrodes.
  • Presented AM noise and click trains across cortical layers.
  • Analyzed AM encoding as a function of cortical layer and hemisphere.

Main Results:

  • Core AC encoded all AM frequencies (1.6-200 Hz) with high accuracy (>90%).
  • Parabelt AC encoded lower AM frequencies (1.6-25 Hz).
  • Granular and infragranular layers showed enhanced AM encoding.
  • Left hemisphere showed enhanced AM encoding, particularly in supragranular layers.

Conclusions:

  • Significant AM temporal encoding persists in the tertiary auditory cortex (parabelt).
  • Layer-specific hemispheric differences suggest supragranular origin of left-hemisphere dominance in temporal encoding.
  • NHP model elucidates circuit mechanisms for AM encoding transformations.