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Updated: May 1, 2026
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Photodiode-Based Optical Imaging for Recording Network Dynamics with Single-Neuron Resolution in Non-Transgenic Invertebrates
Published on: July 9, 2020
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Imaging high-frequency voltage dynamics in multiple neuron classes of behaving mammals
Simon Haziza1, Radosław Chrapkiewicz1, Yanping Zhang2
1James H. Clark Center, Stanford University, Stanford, CA 94305, USA; CNC Program, Stanford University, Stanford, CA 94305, USA; Department of Biology, Stanford University, Stanford, CA 94305, USA.
Cell
|July 17, 2025
Summary
New TEMPO (transmembrane electrical measurements performed optically) technologies offer unprecedented sensitivity for tracking high-frequency neural oscillations. These tools enable detailed analysis of neural dynamics and interactions in both healthy and diseased brains.
Area of Science:
- Neuroscience
- Biotechnology
- Optical Imaging
Background:
- Genetically encoded voltage indicators are crucial for monitoring neural activity.
- Existing voltage-imaging instrumentation lacks sensitivity for high-frequency neural oscillations.
Purpose of the Study:
- Introduce two novel TEMPO (transmembrane electrical measurements performed optically) voltage-sensing technologies.
- Enhance sensitivity and temporal resolution for neural oscillation detection.
Main Methods:
- Developed fiber-optic TEMPO for high-sensitivity, hour-long recordings in freely moving mice.
- Utilized TEMPO mesoscope for wide-field voltage imaging in head-fixed animals.
- Recorded neural oscillations up to ~100 Hz in two distinct neuron classes simultaneously.
Main Results:
- Fiber-optic TEMPO demonstrated ~10-fold greater sensitivity than previous methods.
- Uncovered cross-frequency coupling of theta and gamma oscillations during hippocampal ripples.
- Revealed sensory-evoked excitatory-inhibitory interactions and traveling waves in visual cortex.
Conclusions:
- TEMPO technologies significantly advance the ability to study neural oscillations and neuron-type interactions.
- These tools provide new insights into brain dynamics in both healthy and diseased states.
- Applications include probing diverse brain oscillations and cell-type specific dynamics.
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