Marking multi-channel silicon-substrate electrode recording sites using radiofrequency lesions

Area of Science:

• Neuroscience
• Electrophysiology
• Bioengineering

Background:

• Silicon-substrate multi-channel electrodes (multiprobes) are vital for electrophysiological recordings.
• Identifying individual channel sites is crucial for analyzing heterogeneous neural structures.
• Traditional lesion marking methods have limitations.

Purpose of the Study:

• To present a novel method for marking individual recording sites on 16-channel linear array multiprobes using radio-frequency (rf) lesions.
• To evaluate the efficacy and impact of rf lesions on multiprobe integrity.

Main Methods:

• Utilized a commercial radio-frequency (rf) lesioner with custom connectors for a 16-channel linear array multiprobe.
• Performed in vitro calibration to determine optimal current-voltage-time parameters.
• Applied the rf lesioning technique in vivo to chinchilla inferior colliculus.

Main Results:

• Successfully visualized individual multiprobe recording sites in 21 out of 33 probe tracks (64% success rate).
• Demonstrated that the rf method has a low impact on multiprobe integrity.
• Established well-documented in vitro calibration methods for rf lesioning.

Conclusions:

• Radio-frequency (rf) lesions provide a reliable method for marking individual sites on multi-channel electrodes.
• This technique offers clear visualization and preserves probe functionality.
• The rf lesioning method is applicable to various electrophysiological research scenarios.