1. Scalp EEG Separation During RSVP Tasks
Kaushik Majumdar
Indian Statistical Institute
Bangalore Center
Done with Robert M. Frank in EGI & University of Oregon in 2006

2. Neurotechnology for Intelligent Analysts
Funded by DARPA of USA in 2006.
8 teams involved.

3. The RSVP Task Grey scale satellite images were presented at 3/s rate.
# interesting object : # non-interesting objects ≈ 1 : 3.
256 channel geodesic sensor net of the EGI.

4. Target Objects
Tank
Truck
Boat

5. Scalp Potential
Parra et al., NeuroImage 28 : 328 – 341, 2005.

6. Weighted Average EEG
Parra et al., NeuroImage 28 : 328 – 341, 2005.

7. Raster Plot of Two Channels
Parra et al., NeuroImage 28 : 328 – 341, 2005.

8. FP1 Channel of a Subject
Huang et al.,

9. FP1 in 10 – 20 System

10. ERP Scalp Image of FP1 of a Subject
Huang et al.,

11. 96 tank trials versus 342 non-tank trials for subject 1
PLR
Fisher
Two cluster
Tank
0.9571
0.7321
0.9433
Non-tank
0.5491
0.8386
0.6036
ROC area
0.8912
0.8300
0.7807

12. 96 tank trials versus 57 truck trials for subject 1
PLR
Fisher
Two cluster
Tank
0.5692
0.9975
0.6946
Truck
0.4737
0.9860
0.8519
ROC area
0.5227
0.7743

13. Logistic Regression
Parra et al., NeuroImage 28 : 328 – 341, 2005.

14. Fisher’s Linear Discriminant

15. Two Cluster Discriminant

16. THANK YOU
Slides available at