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Updated: Jun 6, 2026

In vivo Optogenetic Stimulation of the Rodent Central Nervous System
09:37

In vivo Optogenetic Stimulation of the Rodent Central Nervous System

Published on: January 15, 2015

Bold claims for optogenetics.

Nikos K Logothetis1

  • 1Max Planck Institute for Biological Cybernetics, Tuebingen, Germany. nikos.logothetis@tuebingen.mpg.de

Nature
|November 26, 2010
PubMed
Summary
This summary is machine-generated.

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Optogenetics combined with fMRI reveals brain connectivity by linking neuronal excitation to blood oxygenation signals. However, the precise neuronal activity causing these signals remains unidentified.

Area of Science:

  • Neuroscience
  • Physiology

Background:

  • Optogenetic stimulation combined with functional magnetic resonance imaging (fMRI) was used to investigate the relationship between pyramidal-cell activity and the blood oxygen-level dependent (BOLD) signal.
  • An adeno-associated viral vector expressing channelrhodopsin (ChR2) was introduced into the primary motor cortex (M1) of adult rats, rendering projection neurons light-sensitive.

Discussion:

  • The study explored how selective activation of light-sensitive pyramidal cells impacts the BOLD signal and assessed the utility of this technique for mapping brain connectivity.
  • While the findings indicate that pyramidal cell excitation correlates with positive BOLD signals in both local and remote brain regions, the analysis overlooks potential contributions from other neural circuits.
  • The immediate activation of alternative circuits, possibly through perisynaptic activity rather than direct spiking, could also generate BOLD signals, complicating the interpretation.

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Ex Vivo Optogenetic Interrogation of Long-Range Synaptic Transmission and Plasticity from Medial Prefrontal Cortex to Lateral Entorhinal Cortex
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Ex Vivo Optogenetic Interrogation of Long-Range Synaptic Transmission and Plasticity from Medial Prefrontal Cortex to Lateral Entorhinal Cortex

Published on: February 25, 2022

Laser-scanning Photostimulation of Optogenetically Targeted Forebrain Circuits
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Laser-scanning Photostimulation of Optogenetically Targeted Forebrain Circuits

Published on: December 27, 2013

Related Experiment Videos

Last Updated: Jun 6, 2026

In vivo Optogenetic Stimulation of the Rodent Central Nervous System
09:37

In vivo Optogenetic Stimulation of the Rodent Central Nervous System

Published on: January 15, 2015

Ex Vivo Optogenetic Interrogation of Long-Range Synaptic Transmission and Plasticity from Medial Prefrontal Cortex to Lateral Entorhinal Cortex
11:31

Ex Vivo Optogenetic Interrogation of Long-Range Synaptic Transmission and Plasticity from Medial Prefrontal Cortex to Lateral Entorhinal Cortex

Published on: February 25, 2022

Laser-scanning Photostimulation of Optogenetically Targeted Forebrain Circuits
07:43

Laser-scanning Photostimulation of Optogenetically Targeted Forebrain Circuits

Published on: December 27, 2013

Key Insights:

  • Optogenetic stimulation of pyramidal neurons in M1 induced BOLD signals in M1 and connected thalamic nuclei, suggesting functional connectivity.
  • The study demonstrated the potential of combining optogenetics with fMRI for probing neural circuits and their hemodynamic responses.

Outlook:

  • Further research is needed to differentiate BOLD signal contributions from direct neuronal spiking versus other neural activities like perisynaptic signaling.
  • Clarifying the specific neuronal events underlying the BOLD signal is crucial for refining neuroimaging techniques and understanding brain function.