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A Cortical Mechanism Linking Saliency Detection and Motor Reactivity in Rhesus Monkeys.

Giacomo Novembre1, Irene Lacal2,3, Diego Benusiglio4,5

  • 1Neuroscience of Perception & Action Lab, Italian Institute of Technology, Rome 00161, Italy giacomo.novembre@iit.it.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|November 10, 2023
PubMed
Summary
This summary is machine-generated.

Sudden sensory events trigger neural processes for adaptive behavior. Monkeys showed force adjustments and brain activity (EEG/LFP) linked to unexpected sounds, revealing a preserved corticomotor mechanism.

Keywords:
electroencephalography (EEG)event-related potentials (ERPs)forcelocal field potentials (LFPs)monkeysaliency

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Area of Science:

  • Neuroscience
  • Comparative Psychology
  • Motor Control

Background:

  • Adaptive behavior is crucial for survival, requiring rapid adjustments to unexpected environmental stimuli.
  • Understanding the neural basis of behavioral adaptation to salient sensory events is key.

Purpose of the Study:

  • To investigate the phylogenesis and neural mechanisms of behavioral adaptation to surprising sensory events.
  • To examine the effects of unexpected auditory stimuli on motor behavior and prefrontal cortex activity.

Main Methods:

  • Rhesus monkeys performed a force-exertion task with an isometric joystick.
  • Recorded scalp electroencephalography (EEG) and local field potentials (LFPs) from the dorsolateral prefrontal cortex.
  • Analyzed force modulation and electrophysiological responses to surprising auditory stimuli.

Main Results:

  • Auditory stimuli caused a biphasic force modulation (transient decrease, then increase) and distinct EEG/LFP deflections (N70, P130).
  • The P130 amplitude correlated with the magnitude of the corrective force increase, especially in deeper cortical layers.
  • EEG potentials resembled the human vertex potential, suggesting phylogenetic preservation.

Conclusions:

  • Disclosed a phylogenetically preserved corticomotor mechanism for adaptive behavior.
  • Demonstrated a tight coupling between electrocortical potentials and behavioral adjustments to salient events.