Related Experiment Video
Updated: Jul 18, 2026
12:38
State-Dependency Effects on TMS: A Look at Motive Phosphene Behavior
Published on: December 28, 2010
Phosphene induction by microstimulation of macaque V1
Edward J Tehovnik1, Warren M Slocum
1Department of Brain and Cognitive Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139 USA. tehovnik@mit.edu
Brain Research Reviews
|December 19, 2006
Summary
Researchers studied electrical microstimulation in macaque monkeys
Area of Science:
- Neuroscience
- Biomedical Engineering
Background:
- Developing cortical visual prostheses is crucial for treating blindness.
- Understanding phosphene induction is key to creating effective visual prostheses.
Purpose of the Study:
- To investigate phosphene induction through electrical microstimulation of the striate cortex (V1) in macaque monkeys.
- To inform the development of better cortical visual prostheses for the blind.
Main Methods:
- Analysis of electrical microstimulation properties in the V1 of macaque monkeys.
- Utilizing established V1 properties: retino-cortical magnification, receptive-field size, and hypercolumn characteristics.
Main Results:
- Phosphene size correlates with delivered current and retino-cortical magnification factor.
- Phosphene location is retinocentric, influenced by vergence angle for depth perception.
Conclusions:
- Controlling both eyes experimentally is necessary for precise phosphene location matching V1 stimulation site.
- Understanding microstimulation's interaction with cortical tissue is fundamental for effective visual prostheses.
