Journal article

Consistency of Long-Term Subdural Electrocorticography in Humans

Ewan S Nurse, Sam E John, Dean R Freestone, Thomas J Oxley, Hoameng Ung, Samuel F Berkovic, Terence J O'Brien, Mark J Cook, David B Grayden

IEEE TRANSACTIONS ON BIOMEDICAL ENGINEERING | IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC | Published : 2018

Abstract

OBJECTIVE: Subdural electrocorticography (ECoG) can provide a robust control signal for a brain-computer interface (BCI). However, the long-term recording properties of ECoG are poorly understood as most ECoG studies in the BCI field have only used signals recorded for less than 28 days. We assessed human ECoG recordings over durations of many months to investigate changes to recording quality that occur with long-term implantation. METHODS: We examined changes in signal properties over time from 15 ambulatory humans who had continuous subdural ECoG monitoring for 184-766 days. RESULTS: Individual electrodes demonstrated varying changes in frequency power characteristics over time within ind..

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