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. 2016 Jun 14;6:27751. doi: 10.1038/srep27751

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Copyright © 2016, Macmillan Publishers Limited

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(A) BeMim conditioning phase. Participants were first instructed to make an expression and hold it. After a variable delay a video appeared that displayed either the same (mimicking face) or the other expression (non-mimicking face). (B) Preferential looking phase. The faces shown previously during the conditioning were presented side by side while recording the participant’s eye gaze behaviour. To ensure their attention to the screen, the participants performed an oddball task where they were asked to press a button when they noticed the fixation cross that was presented during the ISI change its colour. Eye gaze data were extracted for the face region only (elliptic ROI drawn in TobiiStudio) of each face (marked here in green for clarification).