Classification of Cognitive States Using Clustering-Split Time Series Framework

Abstract

Over the last two decades, functional Magnetic Resonance Imaging (fMRI) has provided immense data about the dynamics of the brain. Ongoing developments in machine learning suggest improvements in the performance of fMRI data analysis. Clustering is one of the critical techniques in machine learning. Unsupervised clustering techniques are utilized to partition the data objects into different groups. Supervised classification techniques applied to fMRI data facilitate the decoding of cognitive states while a subject is engaged in a cognitive task. Due to the high dimensional, sparse, and noisy nature of fMRI data, designing a classifier model for estimating cognitive states becomes challenging. Feature selection and feature extraction techniques are critical aspects of fMRI data analysis. In this work, we present one such synergy, a combination of Hierarchical Consensus Clustering (HCC) and the Statistics of Split Timeseries (SST) framework to estimate cognitive states. The proposed HCC-SST model’s performance has been verified on StarPlus fMRI data. The obtained experimental results show that the proposed classifier model achieves 99% classification accuracy with a smaller number of voxels and lower computational cost.

Keywords

functional MRI data, classification, consensus clustering, SVM classifier, GNB classifier, XGBoost,

References

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Published
Apr 8, 2024
How to Cite
RAMAKRISHNA, J. Siva; RAMASANGU, Hariharan. Classification of Cognitive States Using Clustering-Split Time Series Framework. Computer Assisted Methods in Engineering and Science, [S.l.], v. 31, n. 2, p. 241–260, apr. 2024. ISSN 2956-5839. Available at: <https://cames.ippt.pan.pl/index.php/cames/article/view/448>. Date accessed: 18 july 2024. doi: http://dx.doi.org/10.24423/cames.2024.448.
Section
[CLOSED]Scientific Computing and Learning Analytics for Smart Healthcare Systems