An electrode is a conductive material that facilitates the transfer of electrical current between a medium and an external circuit. In the context of EEG-based brain-computer interfaces, electrodes play a critical role in capturing the brain's electrical activity, allowing for the interpretation and translation of neural signals into actionable commands. They can be placed on the scalp or within the brain to detect voltage changes associated with neuronal activity, making them essential for communication between the brain and external devices.
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