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

Neurotechnology for Intelligent Analysts

• Funded by DARPA of USA in 2006.

• 8 teams involved.

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.

Target Objects

• Tank

• Truck

• Boat

Scalp Potential

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

Weighted Average EEG

Raster Plot of Two Channels

FP1 Channel of a Subject

Huang et al., http://www.bme.ogi.edu/~huangca/papers/C8.pdf

FP1 in 10 – 20 System

http://en.wikipedia.org/wiki/10-20_system_(EEG)

ERP Scalp Image of FP1 of a Subject

Huang et al., http://www.bme.ogi.edu/~huangca/papers/C8.pdf

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

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 0.9975 0.7743

Logistic Regression

Fisher’s Linear Discriminant

Two Cluster Discriminant

THANK YOU

Slides available at http://www.isibang.ac.in/~kaushik/ISSR-2010.ppt

Scalp EEG Separation During RSVP Tasks

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