A slim needle-shaped multiwire microelectrode for intracerebral recording

Area of Science:

• Neuroscience
• Biomedical Engineering
• Electrophysiology

Background:

• Accurate recording of neural activity is crucial for understanding brain function.
• Existing microelectrode technologies may have limitations in spatial resolution or adaptability for specific experimental needs.

Purpose of the Study:

• To describe the construction and characteristics of a novel needle-shaped multiwire microelectrode.
• To demonstrate its utility for laminar analysis of evoked potentials and current source density in the rat cortex.

Main Methods:

• Construction of a 12-channel microelectrode using insulated nichrome wires embedded in epoxylite resin.
• Alignment of wire tips with precise spacing for laminar profiling.
• Recording of field potentials in the rat somatosensory cortex following median nerve stimulation.

Main Results:

• The microelectrode features a needle shape with outer dimensions of 100x180 to 100x100 microns.
• Demonstrated successful recording of evoked potentials and current source density distribution.
• The electrode design is adaptable for various experimental requirements, including single-unit activity recording.

Conclusions:

• The described multiwire microelectrode is a versatile, biocompatible tool for electrophysiological recordings.
• It is suitable for both acute and chronic studies of field potentials and multiple-unit activity.
• The electrode's construction is simple and can be modified for diverse research applications.