Electroencephalographic Measurements
CORTEX, -20
EEG activity was recorded during the modified Eriksen flanker test using a computerized polygraph system with a 31-channel Poly G-A (LAXTHA, Daejeon, South Korea). Ag-AgCl electrodes were placed on frontal (Fz), central (Cz), and parietal (Pz) cortex areas, according to the International 10-20 system. Midline locations were referenced to link earlobe electrodes. Horizontal and vertical electrooculograms were monitored by electrodes placed above and below the left eye and at the outer canthus of both eyes, respectively. The impedance of all electrodes was maintained below 10 kΩ. The bandpass filter of the amplifier was 0.3-30 Hz, the sampling rate was 1000 Hz, and a notch filter was at 60 Hz.The stimulus-locked epochs acquired for the Eriksen flanker test were extracted offline from 200 ms before and ending 1500 ms after the stimulus onset, and the period from –100 to 0 ms before stimuli onset was used as the baseline. Peak amplitudes and latencies were measured automatically. The N2 and P3b peak amplitudes and latencies were measured in the difference waves of the attended condition. The N2 component was defined as the largest positive peak occurring between 180 and 315 ms after stimuli, and the P3b component was defined as the largest positive peak occurring between 300 and 600 ms after stimuli. EEG data were collected before and after the 12-week exercise intervention.