Equalization for intracortical microstimulation artifact reduction

Area of Science:

• Neuroscience
• Biomedical Engineering
• Signal Processing

Background:

• Intra-cortical microstimulation (ICMS) is crucial for neuroscience research and brain-computer interfaces.
• Artifacts generated during ICMS can obscure neural signals, complicating data analysis.
• Existing methods for artifact reduction in ICMS are often insufficient.

Purpose of the Study:

• To develop and evaluate a novel method for reducing artifact duration during ICMS recordings.
• To adapt techniques from digital communications for artifact mitigation in electrophysiological recordings.
• To assess the efficacy of a Zero Forcing Equalizer (ZFE) based stimulus for artifact reduction.

Main Methods:

• Characterized ICMS artifacts as a communications channel.
• Replaced traditional stimulation pulses with a patterned pulse stream generated by a Zero Forcing Equalizer (ZFE) filter.
• Evaluated the reduction in artifact width using the ZFE stimulus.

Main Results:

• The ZFE stimulus demonstrated a significant reduction in artifact width, exceeding 70%.
• The proposed method effectively minimizes the temporal extent of ICMS-induced artifacts.
• Hardware implementation considerations for the ZFE equalizer were discussed.

Conclusions:

• The ZFE-based stimulation technique offers a promising approach to mitigate ICMS artifacts.
• This method has the potential to improve the quality of neural recordings and data interpretation.
• Further research into hardware implementation can facilitate clinical and research applications.