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Relaxation-Based Feature Selection for Single-Trial Decoding of Bistable Perception
Journal article   Open access

Relaxation-Based Feature Selection for Single-Trial Decoding of Bistable Perception

Zhisong Wang, Alexander Maier, Nikos K Logothetis and Hualou Liang
IEEE transactions on biomedical engineering, v 56(1)
Jan 2009
DOI: https://doi.org/10.1109/TBME.2008.2003260
PMID: 19224724
url
https://doi.org/10.1109/TBME.2008.2003260View
Published, Version of Record (VoR) Open

Abstract

Neurons Humans single-trial decoding Electroencephalography relaxation (RELAX) Decoding Spectral analysis relevance Visual perception perception Support vector machines middle temporal (MT) multitaper spectral analysis structure-from-motion (SFM) Support vector machine classification Frequency sequential forward selection (SFS) local field potential (LFP) redundancy Bistable stimuli feature selection support vector machines (SVMs)
Bistable perception refers to the phenomenon of spontaneously alternating percepts while viewing the same stimulus continuously. Bistable stimuli allow dissociation between stimuli and perception, and thus, provide a unique opportunity for understanding the neural basis of visual perception. In this paper, we focus on a relaxation (RELAX) based algorithm to select features from the multitaper spectral estimates of the multichannel intracortical local field potential (LFP), simultaneously collected from the middle temporal visual cortex of a macaque monkey, for decoding its bistable structure-from-motion (SFM) perception. We demonstrate that RELAX surpasses the conventional sequential forward selection (SFS) by offering the flexibility of modifying selected features. We propose a redundancy reduction preprocessing technique to significantly reduce the computational load for both SFS and RELAX. We exploit the support vector machines classifier based on the selected features for single-trial decoding the reported perception. Our results demonstrate the excellent performance of the RELAX feature selection algorithm. Furthermore, we find that the features in the gamma frequency band (30-100 Hz) of LFP are most relevant to bistable SFM perception. This finding is novel in awake monkey studies and suggests that gamma oscillations carry the most discriminative information for bistable perception of SFM stimuli.

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Domestic collaboration
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Web of Science research areas
Engineering, Biomedical
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