Computer-controlled electrical stimulation for quantitative mapping of human cortical function

Area of Science:

• Neurosurgery
• Neuroscience
• Biomedical Engineering

Background:

• Cortical mapping using electrical stimulation (ES) in neurosurgery often relies on manual current delivery.
• This manual approach limits trial numbers and precision, leading to variable behavioral responses and hindering quantitative data collection for human cortical function studies.

Purpose of the Study:

• To develop and demonstrate a computer-controlled method for precise electrical current delivery to intracranial electrodes.
• To overcome limitations of manual ES for systematic and quantitative mapping of human cortical function.

Main Methods:

• Developed a system for computer-controlled delivery of defined electrical current to implanted intracranial electrodes.
• Implemented time-locked stimulation synchronized with behavioral tasks to systematically measure detection thresholds.

Main Results:

• Demonstrated the ability to rapidly and systematically measure the detection threshold for ES in the human visual cortex over numerous trials.
• Validated the precision and efficiency of computer-controlled ES for quantitative mapping.

Conclusions:

• Computer-controlled ES provides a robust method for systematic and quantitative study of virtually any cerebral cortex region.
• This technique is particularly valuable for characterizing poorly understood cortical areas and confirming stimulation-evoked percepts.