Extracting Single Trial Visual Evoked Potentials using Selective Eigen-Rate Principal Components

Andrews, , Samraj and Palaniappan, , Ramaswamy and Kamel, , Nidal (2005) Extracting Single Trial Visual Evoked Potentials using Selective Eigen-Rate Principal Components. Conference of the World-Academy-of-Science-Engineering-and-Technology, 7. pp. 330-333. ISSN 1307-6884

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Abstract

In single trial analysis, when using Principal Component Analysis (PCA) to extract Visual Evoked Potential (VEP) signals, the selection of principal components (PCs) is an important issue. We propose a new method here that selects only the appropriate PCs. We denote the method as selective eigen-rate (SER). In the method, the VEP is reconstructed based on the rate of the eigen-values of the PCs. When this technique is applied on emulated VEP signals added with background electroencephalogram (EEG), with a focus on extracting the evoked P3 parameter, it is found to be feasible. The improvement in signal to noise ratio (SNR) is superior to two other existing methods of PC selection: Kaiser (KSR) and Residual Power (RP). Though another PC selection method, Spectral Power Ratio (SPR) gives a comparable SNR with high noise factors (i.e. EEGs), SER give more impressive results in such cases. Next, we applied SER method to real VEP signals to analyse the P3 responses for matched and non-matched stimuli. The P3 parameters extracted through our proposed SER method showed higher P3 response for matched stimulus, which confirms to the existing neuroscience knowledge. Single trial PCA using KSR and RP methods failed to indicate any difference for the stimuli.

Item Type: Article
Subjects: Q Science > QA Mathematics > QA75.5-76.95 Electronic computers. Computer science
Divisions: Faculty of Information Science and Technology (FIST)
Depositing User: Ms Rosnani Abd Wahab
Date Deposited: 09 Sep 2011 08:36
Last Modified: 09 Sep 2011 08:36
URI: http://shdl.mmu.edu.my/id/eprint/2267

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