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Classification of Local Field Potentials using Gaussian Sequence Model

Publication ,  Journal Article
Banerjee, T; Choi, J; Pesaran, B; Ba, D; Tarokh, V
Published in: 2018 IEEE Statistical Signal Processing Workshop, SSP 2018
August 29, 2018

A problem of classification of local field potentials (LFPs), recorded from the prefrontal cortex of a macaque monkey, is considered. An adult macaque monkey is trained to perform a memory based saccade. The objective is to decode the eye movement goals from the LFP collected during a memory period. The LFP classification problem is modeled as that of classification of smooth functions embedded in Gaussian noise. It is then argued that using minimax function estimators as features would lead to consistent LFP classifiers. The theory of Gaussian sequence models allows us to represent minimax estimators as finite dimensional objects. The LFP classifier resulting from this mathematical endeavor is a spectrum based technique, where Fourier series coefficients of the LFP data, followed by appropriate shrinkage and thresholding, are used as features in a linear discriminant classifier. The classifier is then applied to the LFP data to achieve high decoding accuracy. The function classification approach taken in the paper also provides a systematic justification for using Fourier series, with shrinkage and thresholding, as features for the problem, as opposed to using the power spectrum. It also suggests that phase information is crucial to the decision making.

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2018 IEEE Statistical Signal Processing Workshop, SSP 2018

DOI

Publication Date

August 29, 2018

Start / End Page

218 / 222
 

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Banerjee, T., Choi, J., Pesaran, B., Ba, D., & Tarokh, V. (2018). Classification of Local Field Potentials using Gaussian Sequence Model. 2018 IEEE Statistical Signal Processing Workshop, SSP 2018, 218–222. https://doi.org/10.1109/SSP.2018.8450778
Banerjee, T., J. Choi, B. Pesaran, D. Ba, and V. Tarokh. “Classification of Local Field Potentials using Gaussian Sequence Model.” 2018 IEEE Statistical Signal Processing Workshop, SSP 2018, August 29, 2018, 218–22. https://doi.org/10.1109/SSP.2018.8450778.
Banerjee T, Choi J, Pesaran B, Ba D, Tarokh V. Classification of Local Field Potentials using Gaussian Sequence Model. 2018 IEEE Statistical Signal Processing Workshop, SSP 2018. 2018 Aug 29;218–22.
Banerjee, T., et al. “Classification of Local Field Potentials using Gaussian Sequence Model.” 2018 IEEE Statistical Signal Processing Workshop, SSP 2018, Aug. 2018, pp. 218–22. Scopus, doi:10.1109/SSP.2018.8450778.
Banerjee T, Choi J, Pesaran B, Ba D, Tarokh V. Classification of Local Field Potentials using Gaussian Sequence Model. 2018 IEEE Statistical Signal Processing Workshop, SSP 2018. 2018 Aug 29;218–222.

Published In

2018 IEEE Statistical Signal Processing Workshop, SSP 2018

DOI

Publication Date

August 29, 2018

Start / End Page

218 / 222