Das Wiedererkennen emotionaler Bilder : eine MEG-Studie

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HAUSWALD, Anne, 2005. Das Wiedererkennen emotionaler Bilder : eine MEG-Studie

@mastersthesis{Hauswald2005Wiede-10437, title={Das Wiedererkennen emotionaler Bilder : eine MEG-Studie}, year={2005}, author={Hauswald, Anne} }

Das Wiedererkennen emotionaler Bilder : eine MEG-Studie application/pdf According to an evolutionary perspective, it seems very reasonable that emotionally relevant events hold an exceptional and privileged position in memory. Surviving and reproduction are the fundamental factors within such a theory. Most behaviour can be reduced to those factors as one reach an attractive source or withdraw from an aversive one. Essentially for fast and efficient dealing with e.g. threatening situations are a quick interpretation of the danger and a preferential processing of associated aspects. Therefore a modulating influence of emotion on recognition is of huge relevance for the ability to act adaptively.<br /><br />Because of its adaptive relevance the interplay of emotion and memory is of interest. So far mainly behavioural and electrophysiological experiments were done. Those studies indicate a modulating effect of emotion on recognition. However, the operating mode of this connection is still unclear. The goal of this study is therefore to contribute to the understanding of the interaction of emotion and memory.<br /><br />In this experiment the effects of visual stimuli of different emotional categories on recognition performance was investigated. Therefore neuromagnetic brain activity was recorded using MEG. Highly arousing pleasant and unpleasant as well as neutral pictures were presented for memorizing. Subsequently these pictures were presented again together with similar new pictures. Participants were instructed to indicate if pictures were old or new. Neuromagnetic activity was recorded during both the encoding and the recall phase. Thereby the emotion effect as well as the old-new effect for emotional items could be examined.<br /><br />During encoding increased frontal activity starting around 300 ms after picture onset was observed particularly for pleasant pictures. For the recognition phase, the data show a frontal interaction of emotion and repetition starting from 300ms. Initially, this interaction was mainly produced by the recognition of old pleasant pictures leading to stronger cortical activity. Later, recognition of both pleasant and unpleasant old pictures leads to an increase in frontal brain activity. Behavioural data parallel this pattern in that both pleasant and unpleasant pictures were recognized more accurately and pleasant pictures only also faster than neutral pictures.<br />These findings are consistent with other data demonstrating an important role of the frontal cortex in both memory and emotion. 2005 deu 2011-03-25T09:17:38Z Hauswald, Anne Recognition memory of emotional pictures - an MEG study 2011-03-25T09:17:38Z Hauswald, Anne deposit-license

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