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- W779029951 abstract "Many aspects of the world we perceive are structured hierarchically. That is – most objects are composed of other objects. For instance, a house consists of walls, doors, windows, a roof and several other components. The starting point of this thesis is the idea that those different levels of a hierarchic object are processed in parallel by our brain and that therefore distributing these processes to different brain structures seems useful. Based on this assumption the question is addressed, as to whether the left and right cerebral hemispheres contribute differentially to the processing of hierarchically structured visual information and, more specifically, what the nature of these differences is. To establish the ‘state of the art’, in the first part almost 50 studies from neuropsychology, psychophysiology, as well as experimental psychology are structured and analyzed. Then, in five own experiments the question is addressed, as to how stimulus properties as well as attentional processes influence the lateralization of the involved processes. For this purpose hierarchical letters – larger (global) letters that are created by arranging several identical smaller (local) letters – are presented for a short time in the left or right visual field. With this visual half-field stimulation it is possible to control, which hemisphere receives the information first. The participants are asked to respond either to the global or the local level of the presented stimulus. By analyzing the associated response times and error rates, it can be concluded how the hemispheres differ with respect to the involved processes. The results of the experiments confirm what the literature review already suggested. Theoretical models that merely assume differences in the perceptual processing cannot fully account for the findings, that differences between the right and left hemisphere mainly occurred, when there was a response conflict, i.e. when local and global information required different responses. When the two levels did not interfere, response times and error rates for stimuli in the right and left visual field were virtually identical. Taken together the results support the idea of dynamic interactions between the two hemispheres. It might be, that the processing is transferred to the specialized hemisphere (the right one for global, the left one for local) only when the demands or the complexity of a task are relatively high. FUNKTIONELLE GEHIRNASYMMETRIEN: EINLEITUNG 1" @default.
- W779029951 created "2016-06-24" @default.
- W779029951 creator A5058015011 @default.
- W779029951 date "2001-01-01" @default.
- W779029951 modified "2023-09-27" @default.
- W779029951 title "Funktionelle Gehirnasymmetrien bei der Verarbeitung globaler und lokaler Merkmale visueller Szenen" @default.
- W779029951 hasPublicationYear "2001" @default.
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