Spatial synchronization of visual stimulus-evoked gamma frequency oscillations in the rat superior colliculus

Gytis Baranauskas*, Gytis Svirskis, Tatiana Tkatch

*Corresponding author for this work

Research output: Contribution to journalArticle

2 Scopus citations

Abstract

In the superior colliculus, visual stimuli can induce gamma frequency oscillations of neuronal activity. It has been shown that in cats, these oscillations are synchronized over distances of greater than 300 -Ìm that may contribute toward visual information processing. We investigated the spatial properties of such oscillations in a rodent because the availability of molecular tools could enable future studies on the role of these oscillations in visual information processing. Using extracellular electrode array recordings in anesthetized rats, we found that visual stimuli-induced gamma and eta frequency (30C115 Hz) oscillations of the local field potential that were synchronized over distances of 600 -Ìm. Multiple-unit events were phase locked to the local field potential signal and showed prominent oscillations during OFF responses. The rate of lower than 5ms cross-electrode coincidences was in line with the response-corrected predictions for each electrode. These data suggest that the synchronized superior colliculus neuronal activity is largely network driven, whereas common synaptic inputs play a minor role.

Original languageEnglish (US)
Pages (from-to)203-208
Number of pages6
JournalNeuroreport
Volume27
Issue number3
DOIs
Publication statusPublished - Jan 28 2016

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Keywords

  • Electrode arrays
  • Oscillations
  • Rats
  • Single-units
  • Superior colliculus
  • Synchrony

ASJC Scopus subject areas

  • Neuroscience(all)

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