21 October 2015 Tracking of electroencephalography signals across brain lobes using motion estimation and cross-correlation
Author Affiliations +
Electroencephalography (EEG) is the signal generated by electrical activity in the human brain. EEG topographic maps (topo-maps) give an idea of brain activation. Functional connectivity helps to find functionally integrated relationship between spatially separated brain regions. Brain connectivity can be measured by several methods. The classical methods calculate the coherence and correlation of the signal. We have developed an algorithm to map functional neural connectivity in the brain by using a full search block matching motion estimation algorithm. We have used oddball paradigm to examine the flow of activation across brain lobes for a specific activity. In the first step, the EEG signal is converted into topo-maps. The flow of activation between consecutive frames is tracked using full search block motion estimation, which appears in the form of motion vectors. In the second step, vector median filtering is used to obtain a smooth motion field by removing the unwanted noise. For each topo-map, several activation paths are tracked across various brain lobes. We have also developed correlation activity maps by following the correlation coefficient paths between electrodes. These paths are selected when the correlation coefficient between electrodes is >70%. We have compared the motion estimation path with the correlation coefficient activation maps. The tracked paths obtained by using motion estimation and correlation give very similar results. The inter-subject comparison shows that four out of five subjects tracked path involves all four (occipital, temporal, parietal, frontal) brain lobes for the same stimuli. The intra-subject analysis shows that three out of five subjects show different tracked lobes for different stimuli.
© 2015 SPIE and IS&T
Seng Hooi Lim, Seng Hooi Lim, Humaira Nisar, Humaira Nisar, Vooi Voon Yap, Vooi Voon Yap, Seong-O Shim, Seong-O Shim, } "Tracking of electroencephalography signals across brain lobes using motion estimation and cross-correlation," Journal of Electronic Imaging 24(6), 061106 (21 October 2015). https://doi.org/10.1117/1.JEI.24.6.061106 . Submission:


Real-time fiber selection using the Wii remote
Proceedings of SPIE (February 23 2010)
Eeg Imaging Of Brain Activity: Methods And Potentials
Proceedings of SPIE (August 02 1984)
Cortex registration: a geometric approach
Proceedings of SPIE (April 11 2005)
A new combined surface and volume registration
Proceedings of SPIE (March 12 2010)

Back to Top