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Related Experiment Video

Updated: Jun 21, 2026

Optogenetic Entrainment of Hippocampal Theta Oscillations in Behaving Mice
07:33

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Published on: June 29, 2018

A microsaccadic rhythm modulates gamma-band synchronization and behavior.

Conrado A Bosman1, Thilo Womelsdorf, Robert Desimone

  • 1Donders Institute for Brain, Cognition and Behaviour, Radboud University Nijmegen, 6525 EN Nijmegen, The Netherlands. c.bosman@donders.ru.nl

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|July 31, 2009
PubMed
Summary

Rhythmic microsaccades (MSs) at 3.3 Hz in monkeys predict neural activity and modulate visual processing speed. This 3.3 Hz rhythm may structure environmental sampling by controlling gamma-band synchronization (GBS).

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Last Updated: Jun 21, 2026

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Area of Science:

  • Neuroscience
  • Systems Neuroscience
  • Computational Neuroscience

Background:

  • Neuronal activity and behavior exhibit rhythms across various frequencies.
  • Low-frequency neuronal rhythms modulate higher-frequency rhythms, like gamma-band synchronization (GBS).
  • Microsaccades (MSs) are small, spontaneous eye movements crucial for visual attention.

Purpose of the Study:

  • Investigate the relationship between MSs and stimulus-induced GBS in awake monkeys.
  • Determine if MSs are linked to specific neuronal rhythms.
  • Understand how MSs influence visual processing and behavioral responses.

Main Methods:

  • Recorded local field potentials (LFPs) in V1 and V4 of awake monkeys.
  • Analyzed stimulus-induced GBS and spontaneous MSs.
  • Correlated LFP rhythms with MS occurrence and timing.
  • Assessed the impact of MS patterns on GBS and behavioral response speed.

Main Results:

  • MSs occurred rhythmically at approximately 3.3 Hz.
  • The phase of the 3.3 Hz rhythm in V1 and V4 LFPs predicted MS occurrence.
  • MSs modulated visually induced GBS.
  • Specific MS patterns preceded fast/slow behavioral responses, explaining response variability through GBS perturbations.

Conclusions:

  • A 3.3 Hz rhythm in V1 and V4 is linked to MSs and influences visual processing.
  • MSs modulate GBS, impacting behavioral response speed.
  • This 3.3 Hz rhythm may organize environmental sampling by dynamically controlling gamma-band neuronal ensembles.