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Using Looming Visual Stimuli to Evaluate Mouse Vision
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Large Visual Stimuli Induce Two Distinct Gamma Oscillations in Primate Visual Cortex.

Dinavahi V P S Murty1, Vinay Shirhatti1,2, Poojya Ravishankar1

  • 1Centre for Neuroscience, Indian Institute of Science, Bangalore, India 560012, and.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|February 15, 2018
PubMed
Summary
This summary is machine-generated.

Researchers discovered two distinct gamma rhythms (slow and fast) in the visual cortex of monkeys and humans. These gamma oscillations differ in their processing range, offering new insights into brain function and potential biomarkers for mental disorders.

Keywords:
EEGLFParea V1gammaoscillationrhythm

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Area of Science:

  • Neuroscience
  • Visual Cortex Research
  • Brain Oscillations

Background:

  • Gamma rhythms are linked to cognitive functions and altered in brain disorders.
  • Previous primate studies reported a single gamma rhythm in the visual cortex.
  • The role of multiple gamma rhythms in visual processing remains unclear.

Purpose of the Study:

  • To investigate the existence and characteristics of multiple gamma rhythms in the primate visual cortex.
  • To compare gamma rhythms induced by large visual stimuli in monkeys and humans.
  • To explore the functional implications of distinct gamma rhythms in visual processing.

Main Methods:

  • Recorded local field potentials (LFP) in the primary visual cortex (V1) of two awake bonnet monkeys.
  • Analyzed electroencephalogram (EEG) data from 15 human subjects exposed to large visual stimuli.
  • Characterized gamma rhythms based on frequency, tuning properties, latency, and coherence.

Main Results:

  • Identified two distinct gamma rhythms: slow (25-45 Hz) and fast (45-70 Hz) in both monkey V1 and human EEG.
  • Observed differential tuning characteristics for stimulus orientation, contrast, drift speed, and size between the two rhythms.
  • Fast gamma showed short latency and short-range coherence, indicative of local processing.
  • Slow gamma exhibited characteristics suggesting long-range processing.

Conclusions:

  • The primate visual cortex exhibits at least two distinct gamma rhythms, challenging previous findings.
  • These slow and fast gamma oscillations potentially support different processing ranges and coding mechanisms.
  • Multiple gamma rhythms may offer a richer neural code for visual stimuli and serve as biomarkers for neuropsychiatric disorders.