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Voltage-sensitive Dye Recording from Axons, Dendrites and Dendritic Spines of Individual Neurons in Brain Slices
Published on: November 29, 2012
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Fast neural population dynamics in primate V1 captured by a genetically-encoded voltage indicator.
Jingyang Zhou1,2,3,4,5, Yuzhi Chen2,3,4,5, Matt Whitmire2,3,4,5
1Center for Computational Neuroscience, Flatiron Institute, New York, USA.
Research Square
|February 20, 2025
Summary
Genetically encoded voltage indicators (GEVIs) now track neural activity in macaque V1 neurons, offering faster and more sensitive measurements than calcium indicators. This breakthrough enables advanced neuroscience research in behaving primates.
Area of Science:
- Neuroscience
- Molecular Biology
- Optical Imaging
Background:
- Genetically encoded voltage indicators (GEVIs) offer cell-type-specific, millisecond-scale measurement of neural electrical activity.
- Previous studies have primarily utilized GEVIs in rodents, limiting their application in primate models.
Purpose of the Study:
- To express a GEVI in excitatory V1 neurons of macaque monkeys for the first time.
- To compare GEVI performance with genetically encoded calcium indicators (GECIs) and synthetic voltage-sensitive dyes (VSDs).
- To develop a model for characterizing GEVI signal dynamics.
Main Methods:
- Successful GEVI expression in macaque V1 excitatory neurons.
- Widefield fluorescent imaging to record V1 neural activity.
- Stimulation with visual stimuli of varying temporal waveforms and contrasts.
- Comparative analysis with GECI and VSD signals.
- Development of a nonlinear model for signal characterization.
Main Results:
- GEVIs demonstrated faster response dynamics and higher temporal frequency tracking compared to GECIs.
- GEVIs detected responses at lower stimulus contrasts than GECIs.
- A nonlinear model accurately predicted GEVI signal dynamics across various stimuli.
- GEVI signals are hypothesized to reflect summed membrane potentials.
Conclusions:
- GEVI expression in primate V1 neurons is feasible and provides superior temporal resolution and sensitivity over GECIs.
- This advancement facilitates novel optical recording experiments in behaving primates.
- GEVI technology opens new avenues for studying neural computation and dynamics in higher-order species.
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