LLMs Cut P300 Speller Keystrokes by More Than 62%, Review Finds
This review traces the evolution of P300 brain-computer interfaces from classic spellers to AI agents. The P300 is a positive brain potential that appears about 300 milliseconds after a rare stimulus, and systems use it to determine which character a user wants to select. According to the review, recent systems such as ChatBCI and MindChat, which pair P300 spellers with large language models, cut keystrokes by more than 62% and nearly triple communication speed. The author also proposes an end-to-end architecture: an EEG headset and a real-time CNN detector, topped by an AI-agent layer made up of an LLM planner and IoT control interfaces.