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  2. Brain–computer interface - Wikipedia

    en.wikipedia.org/wiki/Brain–computer_interface

    In 1990, a report was given on a closed loop, bidirectional, adaptive BCI controlling a computer buzzer by an anticipatory brain potential, the Contingent Negative Variation (CNV) potential. [ 19 ] [ 20 ] The experiment described how an expectation state of the brain, manifested by CNV, used a feedback loop to control the S2 buzzer in the S1-S2 ...