Frequency-dependent entrainment of neocortical slow oscillation to repeated optogenetic stimulation in the anesthetized rat

Toshinobu Kuki, Tomokazu Ohshiro, Shin Ito, Zhi Gang Ji, Yugo Fukazawa, Yoshiya Matsuzaka, Hiromu Yawo, Hajime Mushiake

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

Local field potential (LFP) slow oscillation (<1. Hz) is typically observed in the cortex during sleep or while under anesthesia and reflects synchronous activation/inactivation of the cortical neuron population. The oscillation can be entrained to repeated external sensory stimuli. To better understand the neural mechanism underlying slow-oscillation generation and its entrainment to external stimuli, we delivered optical stimulation to the cortex of anesthetized rats that exogenously expressed the light-sensitive cation channel channelrhodopsin-2 (ChR2) and simultaneously monitored LFPs across cortical layers. We found that the LFPs could be effectively entrained to repeated optical stimulation at 1. Hz in deep layers. A stimulus-triggered current-source density (CSD) analysis showed that the evoked oscillation had the same depth and temporal profile as the slow oscillations, indicating that both oscillations have the same neural mechanism. Optical stimulation primarily induced the transition from the cortical up to down state. These results suggest that the anesthetized rat cortex has an intrinsic mechanism that leads to oscillation near 1. Hz; effective entrainment to the 1. Hz stimulation reflects the resonated state of the cortex to that stimulus. Our study is the first to demonstrate optogenetic manipulation of cortical slow oscillation and provides a mechanistic explanation for slow-oscillation entrainment.

Original languageEnglish
Pages (from-to)35-45
Number of pages11
JournalNeuroscience Research
Volume75
Issue number1
DOIs
Publication statusPublished - 2013 Jan

Keywords

  • Entrainment
  • Neocortex
  • Optogenetics
  • Slow oscillation

ASJC Scopus subject areas

  • Neuroscience(all)

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