John Libbey Eurotext

Chess-playing epilepsy: a case report with video-EEG and back averaging Volume 6, numéro 4, December 2004

Figure 1 Standard EEG during a chess game (amplitude: 10 microvolts/mm, time constant 0.1, 15 Hz filter): repetitive spike-wave discharges are maximum on fronto-central areas on both sides.

Figure 2 A) Back averaging of n = 11 myoclonia of the right upper limb: the cortical spike is located under the electrodes C3 and C4 (phase reversal between F4-C4 and C4-P4 and between F3-C3 and C3-P3; B) Back averaging of n =three myoclonia of the left upper limb: the cortical spike is located under electrode C3 and C4 (phase reversal between F3-C3 and C3-P3 on the left hemisphere, and between F4-C4 and C4-P4 on the right hemisphere); C) Back averaging of n = seven bilateral myoclonia of the upper limbs: the cortical spike is located under electrode C4 (phase reversal between F4-C4 and C4-P4, spike on the opposite hemisphere partially hidden by the noise).