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Single-Cell Electrical Stimulation Using CMOS-Based High-Density Microelectrode Arrays.

Silvia Ronchi1, Michele Fiscella1,2, Camilla Marchetti1

  • 1Department of Biosystems Science and Engineering, ETH Zürich, Basel, Switzerland.

Frontiers in Neuroscience
|March 29, 2019
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Summary
This summary is machine-generated.

Researchers precisely stimulated individual neurons using high-density microelectrode arrays. This advanced technique achieved efficient neural stimulation with minimal charge, enabling precise control of neural activity.

Keywords:
HD-MEAaxon initial segmentcurrent stimulationsingle-cell stimulationvoltage stimulation

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Area of Science:

  • Neuroscience
  • Biophysics
  • Electrical Engineering

Background:

  • Non-invasive electrical stimulation offers potential for studying and modulating neural activity.
  • Precisely targeting individual neurons for stimulation remains a significant challenge in neuroscience.

Purpose of the Study:

  • To investigate single-neuron current and voltage stimulation in vitro.
  • To determine optimal stimulation parameters (waveforms, amplitudes, durations) for precise neural activation.

Main Methods:

  • Utilized high-density microelectrode arrays with 26,400 electrodes (17.5 microm pitch, 5 × 9 microm² area).
  • Performed in vitro single-neuron stimulation to identify optimal parameters for current and voltage modes.
  • Measured stimulation efficiency by monitoring action potential initiation and propagation at the soma.

Main Results:

  • Achieved stimulation of the axon initial segment (AIS) with charges below 2 pC.
  • Identified effective stimulation parameters as low as 70 mV or 100 nA with 18 micros pulse durations.
  • Demonstrated that stimulation amplitude requirements decrease with cell development.
  • Found no improvement in stimulation efficiency with higher electric fields from multi-electrode stimulation.

Conclusions:

  • High-density microelectrode arrays enable precise, low-charge single-neuron stimulation.
  • Optimal stimulation parameters are crucial for efficient neural activation and minimal artifact.
  • Cellular development influences the required stimulation amplitude for neural activation.