Topological Mapping of Sharp Reorganization Synchrony in Multichannel EEG

Abstract

This paper presents a method of using multichannel EEG recordings to study EEG synchronization processes of cortical activity. We found that the picture of the interaction between the cortical areas, which is usually formed with classical crosscorrelation and coherence analysis data, may be significantly supplemented by using “operational synchrony”. Operational synchrony is calculated according to the frequency of the coincidences of sharp reorganization moment (SRM) in the multichannel EEG. These coincidences could reflect the processes of switching between working operations. The paper describes the technology for spatial-temporal mapping of the interchannel coincidences of the SRM in the EEG. In research on healthy humans, performing a memory task on the perception of visual matrixal images, we detected a considerable modification of the topological map of the SRM coincidences in multichannel EEG. This modification depended on the type of the given subject's activity. This model of analysis is appropriate for other areas of EEG research.