The broadband-transient induced gamma-band response in scalp EEG reflects the execution of saccades

Shlomit Yuval-Greenberg, Leon Y. Deouell

Research output: Contribution to journalArticlepeer-review

Abstract

The contraction of the extra-ocular muscles, during the execution of saccades, produces a strong electric potential in the EEG called the saccadic spike potential (SP). At the frequency spectrum, this SP manifests as a broadband response with most of its power at the gamma-band frequencies. Saccadic activity is known to follow a time-pattern of repression (at around 50-150 ms post stimulus) which is followed by a large increase in saccadic rate at around 200-300 ms post stimulus. Due to this temporal pattern relative to the stimulus, and to the appearance of a SP at each saccade, this increase in saccadic rate shows up after averaging as an increase in gamma-band activity at the time-range of 200-300 ms. Thus, the broadband-transient "induced gamma-band response" frequently reported in the EEG literature, is in fact a "gamma-imposter", due to ocular myographic activity, and not to neural activity. Previous findings regarding the scalp EEG broadband-transient induced gamma-band response, relating it to neural synchronization and to various cognitive functions should be reevaluated considering the systematic contamination by ocular activity.

Original languageEnglish
Pages (from-to)3-6
Number of pages4
JournalBrain Topography
Volume22
Issue number1
DOIs
StatePublished - Jun 2009
Externally publishedYes

Keywords

  • EEG
  • Eye tracking
  • Gamma
  • Induced
  • Saccades
  • Spike potential

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