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Neural correlates of emotional facial expressions perception
SLABÝ, Lukáš
This thesis deals with differences of perception of facial emotional expressions at the neural level. The theoretical part contains information about emotions, their basic theories and six basic emotional expressions. Furthermore, the theoretical part clarifies electroencephalography - the method of recording electrical activity of the brain and event-related potentials (ERP). The practical part is focused on the experiment, whose aim is to describe the differences in the event-realted potentials of perception of facial emotional expressions and neutral expression, to compare the event-related potentials of perception of positive and negative emotions and to compare event-related potentials of two databases of facial emotional expressions (WSEFEP, KDEF) which were used in this experiment. 13 subject participes in this experiment. The subjects were exposed to visual stimuli (facial emotional expressions) and the EEG signal were simultaneously recorded. This signal was further filtered and analyzed in Matlab and its EEGlab toolbox. A paired T-test and ANOVA were used for statistical data processing. Four hypotheses for this research were formed. The first hypothesis, which contended that the perception of facial emotional expressions would differ among each other in event-related potentials, was accepted. The second hypothesis, which claimed that there are differences in the event-related potentials of facial emotional expressions and neutral expressions, could not be accepted for lack of evidence. The third hypothesis, which asserted that there are differences in the event-related potentials of perception of positive and negative facial emotional expressions, was accepted. The fourth hypothesis, which asserted that there is a difference in the event-related potentials between the perception of facial emotional expressions from the WSEFEP database and the KDEF database, was accepted for sufficient evidence.
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