Training in Dense Array EEG

 

Collage of brain images.

 

The Brain Electrophysiology Laboratory mixes corporate and academic cultures to weave together science and technology training.

Cross-section of the brain.

 

 

This weaving of science and technology requires cross training among students, scientists, and engineers in multiple basic disciplines, including psychology, neurophysiology, neuroanatomy, computational science, and several physical and chemical technologies. The collaborative team at BEL has come together to work on some of the complex issues facing the neuroimaging field. This image (right) illustrates that the folded anatomy of the cortex leads to extensive superposition of the brain's electrical fields as seen by any given EEG electrode.

 

 

Cross section of the brain.

 

The perspectives from multiple disciplines are then applied in multiple areas, including medicine, education, and human performance. One area this wealth of knowlege has helped to shed light on is the electrical fields of the brain. This image (left) illustrates that a dipole—with opposite positive and negative poles—serves as a good model of the electrical fields generated by cortical activity. When in the sulcus (wrinkle) of the cortex, the fields are tangential (sideways) to the head surface rather than radial (up and down).

 

 
 

Eye blink diagram.The principles of dense array EEG involve physical and physiological concepts. In the laboratory, EGI scientists, graduate students, research assistants, and postdocs work on a regular basis with EGI engineers and computer scientists from the NIC to share perspectives and techniques between disciplines. One such difficult problem addressed at EGI is occular electrical fields, which may be confused with brain activity, as shown in the image above.

 

Increasingly, computation is extending mathematics as the language of science.  The BEL training integrates the interdisciplinary framework of neuroinformatics with the basic principles of human brain electrophysiology and neuroimaging. This exciting collaboration brings groundbreaking research and many new possibilities to the Brain Electrophysiology Laboratory, and to EGI.

 

Ferree, T. & Tucker, D. M. (1999). Development of high-resolution EEG devices. International Journal of Bioelectromagnetism, 1, 4-10.

Ferree, T. C., Eriksen, K. J., & Tucker, D. M. (2000). Regional head tissue conductivity estimation for improved EEG analysis. IEEE Trans Biomed Eng, 47(12), 1584-1592.

Luu, P. & Tucker, D. M. (2003). Self-Regulation and the Executive Functions: Electrophysiological Clues. In A. Zani & A. M. Preverbio (Eds.), The cognitive electrophysiology of mind and brain. (pp. 199-223). San Diego: Academic Press.

Tucker, D. M. (1993). Spatial sampling of head electrical fields: the geodesic sensor net. Electroencephalogr Clin Neurophysiol, 87(3), 154-163.

Tucker, D. M., Liotti, M., Potts, G. F., Russell, G. S., & Posner, M. I. (1994). Spatiotemporal analysis of brain electrical fields. Human Brain Mapping, 1, 134-152.