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Waves of Change: Brain Sensitivity to Differential, not Absolute, Stimulus Intensity is Conserved Across Humans and

R Somervail1,2, F Zhang3,4, G Novembre2

  • 1Department of Neuroscience, Physiology and Pharmacology, University College London, London, WC1E 6BT, UK.

Cerebral Cortex (New York, N.Y. : 1991)
|October 7, 2020
PubMed
Summary

The brain

Keywords:
behavioral relevanceelectrocorticography (ECoG)electroencephalography (EEG)multispecies investigationsaliency-detection

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Area of Science:

  • Neuroscience
  • Sensory Perception
  • Mammalian Brain Evolution

Background:

  • Mammalian brains are highly sensitive to intense sensory events, crucial for survival in changing environments.
  • These events trigger widespread electrocortical responses, such as the vertex potential (VP), aiding behavioral reactions.
  • The factors influencing VP magnitude, specifically stimulus intensity components, are not fully understood.

Purpose of the Study:

  • To investigate whether the magnitude of the vertex potential (VP) is influenced by the absolute or differential components of stimulus intensity.
  • To determine if this sensitivity to intensity components is modality-specific or conserved across species.

Main Methods:

  • Systematically varied abrupt increases in stimulus intensity against different background intensities.
  • Recorded electrocortical activity using scalp electroencephalography in humans and epidural electrocorticography in rats.
  • Dissociated the effects of absolute and differential stimulus intensity on VP magnitude.

Main Results:

  • VP magnitude is primarily determined by the differential component of stimulus intensity, not the absolute intensity.
  • This finding was consistent across both auditory and somatosensory stimuli, indicating supramodal sensitivity.
  • The sensitivity to abrupt intensity changes is conserved in both humans and rats, suggesting phylogenetic significance.

Conclusions:

  • Large electrocortical responses, like the VP, are optimized for detecting sensory changes rather than absolute levels.
  • This sensitivity to change is a fundamental, evolutionarily conserved feature of mammalian sensory processing.
  • The brain prioritizes detecting novel events or objects signaled by abrupt sensory intensity shifts.