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Related Experiment Video

Updated: Aug 7, 2025

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Surgical Procedure for Implantation of Opto-Array in Nonhuman Primates.

Reza Azadi1, Simon Bohn1,2, Mark A G Eldridge1

  • 1Laboratory of Neuropsychology, National Institute of Mental Health, NIH, Bethesda, Maryland.

Current Protocols
|March 13, 2023
PubMed
Summary

Optogenetics in large brains is challenging. The Opto-Array device enables precise light delivery to large cortical areas in nonhuman primates, improving optogenetic studies and potentially aiding vision restoration research.

Keywords:
braincortexinferior temporal cortexmonkeyoptogeneticssurgery

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Area of Science:

  • Neuroscience
  • Optogenetics
  • Primate Research

Background:

  • Optogenetics offers precise neuronal control but faces challenges in large brains like nonhuman primates.
  • Existing methods for virus delivery and light stimulation are difficult for extensive cortical areas.
  • Nonhuman primates are crucial models for understanding complex brain functions and developing therapies.

Purpose of the Study:

  • To present protocols for surgical delivery of virus and implantation of the Opto-Array device in rhesus monkeys.
  • To demonstrate the efficacy of the Opto-Array for high-throughput behavioral optogenetics in large primate brains.
  • To establish a method for chronic perturbation of neuronal activity across large cortical regions.

Main Methods:

  • Developed and tested protocols for virus injection and Opto-Array implantation surgery in rhesus monkeys.
  • Utilized the Opto-Array to deliver light stimulation to the inferior temporal cortex.
  • Assessed behavioral performance in a Cortical Perturbation Detection (CPD) task under varying illumination parameters.

Main Results:

  • The Opto-Array successfully enabled detection of optogenetic stimulation across tested illumination powers and durations.
  • Both illumination power and duration significantly modulated the detectability of the optogenetic stimulation.
  • The chronic and stable nature of the Opto-Array allows for data pooling over extended periods.

Conclusions:

  • The Opto-Array provides a superior method for optogenetic modulation of large cortical surface areas in nonhuman primates compared to traditional methods.
  • This technique facilitates high-throughput behavioral studies and chronic perturbation of neuronal activity.
  • The presented methods lay the foundation for future applications, including potential vision restoration in humans.