EEG data were collected from 66 channels, using the international 10 -10 system.60 electrodes measured the electrical activity in the scalp and 4 bipolar near the eyes to measure the eye blinks and movements and 2 in each earlobe; all referred to an average reference. A sampling rate of 500 Hz was used with an analog pass band between 0.01 and 100 Hz and a notch filter at 50 Hz (QuickAmp-72, Brain Products, Germany and custom cap, Electro Cap International, USA). Input impedances were brought under 5 kΩ by careful scalp preparation. Data were analyzed by custom Analyzer 2.0 (Brain Products, Germany). Data were digitally filtered to remove frequencies above 40 Hz and below 0.1 Hz and were then
separated into epochs time-locked to stimulus onset. Artifact rejection to remove high amplitude,frequency muscle noise and other irregular artifacts, were removed semi-automatically with the following criteria: max. amplitude of -100/100 μV; max. gradient of 50 μV/ms; low activity below 0,1 μV during 100 ms or max
EEG data were collected from 66 channels, using the international 10 -10 system.60 electrodes measured the electrical activity in the scalp and 4 bipolar near the eyes to measure the eye blinks and movements and 2 in each earlobe; all referred to an average reference. A sampling rate of 500 Hz was used with an analog pass band between 0.01 and 100 Hz and a notch filter at 50 Hz (QuickAmp-72, Brain Products, Germany and custom cap, Electro Cap International, USA). Input impedances were brought under 5 kΩ by careful scalp preparation. Data were analyzed by custom Analyzer 2.0 (Brain Products, Germany). Data were digitally filtered to remove frequencies above 40 Hz and below 0.1 Hz and were then
separated into epochs time-locked to stimulus onset. Artifact rejection to remove high amplitude,frequency muscle noise and other irregular artifacts, were removed semi-automatically with the following criteria: max. amplitude of -100/100 μV; max. gradient of 50 μV/ms; low activity below 0,1 μV during 100 ms or max
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