Visualization of Evoked EEG Responses Trivector Visualization Emil

Visualization of Evoked EEG Responses: Trivector Visualization Emil Jovanov http: //www. ece. uah. edu/~jovanov@ece. uah. edu Associate Professor Electrical and Computer Eng. Dept. University of Alabama in Huntsville March 19, 2004 IHMC 2004

Visualization of Evoked Potentials EP - Insight into spatio-temporal dynamics of brain electrical activity Important for cognitive studies Animated 3 D visualization improves perception of underlying activity Tempo EP visualization environment Quest for the right paradigm Trivector Neuro. Scan (TVR) method Quantitative analysis of activity Scalar Assessment of Neurological Cognitive Deficits March 19, 2004 IHMC 2004 2

3 D Topographic Map EEG ERP March 19, 2004 IHMC 2004 3

Tri. Vector – Electrodes March 19, 2004 IHMC 2004 4

2 D plot example March 19, 2004 IHMC 2004 5

Tri. Vector – 3 D Animation 3 -D Animated Visualization Animated visualization of the electrical evoked potential magnitude vectors Virtual Source (red ball) Fade out positions Strength & direction Dynamic animation as they sweep through the brain during interrogation via random or expected audio/visual stimuli March 19, 2004 IHMC 2004 6

Trivector 3 D Animation March 19, 2004 IHMC 2004 7

Trivector 3 D Animation March 19, 2004 IHMC 2004 8

TVR conclusion and future work Promising combination of EEG ERP and TVR ERP data Real time analysis of the cognitive workload Portable implementation Research issues Cognitive studies Diagnostic applications Perceptual issues The role of artifacts March 19, 2004 IHMC 2004 9