Spatial organization of biopotentials and the originality of visual images


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Abstract

The characteristics of the spatial organization of biopotentials in the neocortex during the mental creation of original and standard mental images were studied. Intra-and interhemisphere coherence associations at different EEG frequency ranges were assessed, along with linkages between relative changes in measures of linear (correlation coefficient) and non-linear (multiple entropy) processes between different areas of the neocortex. Creation of original thoughts was found to be associated with a significantly smaller number of associations with decreased coherence in the high-frequency alpha range between distant points than on formation of standard images. On formation of original images, the number of concordantly functioning pairs of cortical areas and the mean level of synchronization between them were greater in terms of linear processes than on formation of standard images, while in terms of non-linear processes, the number was, conversely, smaller. The correlational relationships between changes in different cortical areas for both types of process were only positive on creation of original images, while creation of standard images yielded both positive and negative correlations. These data lead to the conclusion that the spatial organization of biopotentials during the mental creation of original and standard images differs in terms of the cortical distribution of concordant changes in linear and non-linear processes, their levels of linkage, and the nature of interhemisphere interactions. Data on differential interhemisphere interactions in the diagonal and central bilateral profiles suggest the radial representation of visual imagination.

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