EEG Face Emotion

Continuous EEG was recorded using a 32-channel ActiveTwo BioSemi system (Amsterdam, Netherlands), configured to the standard International 10-20 System (channels: 28 lateral channels FP1/2; F7/8; F3/4; AF3/4; FC1/2, FC5/6, C3/4, T7/8, CP1/2, CP5/6, P3/4, P7/8, O1/2, PO3/4, plus 4 midline channels Fz, Cz, Pz, Oz). For some children, an additional eye-electrode was placed behind the child’s left eye (Ex3), and/or additional loose electrodes were positioned at the mastoids (Ex1-2). Electrodes offset were less than 20μv. The EEG data were recorded relative to common mode sense and driven right leg (CMS/DRL) electrodes placed near Cz. Continuous EEG was acquired at a 2048Hz sample rate using Actiview (version 7.05) from a Dell latitude E5540 laptop (operating system Windows 10 Professional; in lab 0.41 version details: i5-4310U CPU @ 2,00 GHz 2,60GHz 8GB; in lab 0.42, version details: i3-4010U CPU @ 1,70 GHz 1,70GHz 4GB). Tasks were programmed in Matlab using Psych-Toolbox 3 (Brainard & Vision, 1997) from a second laptop (MacBookPro 11,1 13 inch retina OSX 10.9.5 Intel Core i7 2,8 GHz 16GB 1600 MHz DDR3).