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Related Experiment Videos

A multi-electrode array for combined microiontophoresis and multiple single-unit recordings

S Haidarliu1, D Shulz, E Ahissar

  • 1Department of Neurobiology, Weizmann Institute of Science, Rehovot, Israel.

Journal of Neuroscience Methods
|February 1, 1995
PubMed
Summary

Researchers developed a novel multi-electrode array for precise drug delivery and neural recording. This system allows modulation of the local pharmacological environment for up to 12 neurons simultaneously.

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Area of Science:

  • Neuroscience
  • Electrophysiology
  • Pharmacology

Background:

  • Accurate recording of neural activity and targeted drug delivery are crucial for understanding brain function.
  • Existing multi-electrode arrays often lack the capability for simultaneous drug ejection and multi-unit recording.
  • Precise control over the local chemical environment is essential for studying neuronal responses.

Purpose of the Study:

  • To describe a novel remotely controlled multi-electrode array with a combined electrode (CE).
  • To evaluate the CE's capability for ejecting neuroactive substances and recording single-unit activity.
  • To assess the array's efficacy in modulating neuronal activity in response to drug application.

Main Methods:

  • Fabrication of a combined electrode (CE) using standard materials and micropipette pullers.

Related Experiment Videos

  • Integration of the CE with tungsten-in-glass electrodes (TEs) into a 4-electrode array.
  • In vivo recordings in the auditory cortex of anesthetized guinea pigs, ejecting glutamate, acetylcholine, and atropine.
  • Application of spike sorting techniques to analyze neural data.

    • Main Results:

    • The CE demonstrated a favorable balance of stiffness and flexibility, stability, and effective ejection properties.
    • Extracellular drug ejection modulated single-neuron firing patterns and evoked responses consistent with known pharmacological effects.
    • The array successfully recorded effects on neuronal activity up to 900 microns from the CE tip.

    Conclusions:

    • The developed multi-electrode array provides a robust platform for simultaneous neural recording and targeted drug delivery.
    • This technology enables precise modulation of the local pharmacological environment for studying neuronal function and interactions.
    • The system offers a valuable tool for investigating neuropharmacology and neural circuit dynamics.