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(A) Hippocampus head stimulation at intensities of 3 and 4 mA induced instant central apnea in patient 2. Apnea periods ended before stimulation was discontinued. (C) Apnea with 3 mA intensity stimulation of the hippocampus head in patient 2. (B, D) Stimulation in patient 2 at 6, 7, and 8 mA current intensities induced immediate change in respiratory rhythm. Central apnea was elicited at 10 mA current intensity in the same patient.
