EEG/fNIRS Based workload classification using functional brain connectivity and machine learning

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dc.contributor.authorCao, Jun
dc.contributor.authorMartin Garro, Enara
dc.contributor.authorZhao, Yifan
dc.date.accessioned2022-10-13T08:08:56Z
dc.date.available2022-10-13T08:08:56Z
dc.date.issued2022-10-08
dc.description.abstractThere is high demand for techniques to estimate human mental workload during some activities for productivity enhancement or accident prevention. Most studies focus on a single physiological sensing modality and use univariate methods to analyse multi-channel electroencephalography (EEG) data. This paper proposes a new framework that relies on the features of hybrid EEG–functional near-infrared spectroscopy (EEG–fNIRS), supported by machine-learning features to deal with multi-level mental workload classification. Furthermore, instead of the well-used univariate power spectral density (PSD) for EEG recording, we propose using bivariate functional brain connectivity (FBC) features in the time and frequency domains of three bands: delta (0.5–4 Hz), theta (4–7 Hz) and alpha (8–15 Hz). With the assistance of the fNIRS oxyhemoglobin and deoxyhemoglobin (HbO and HbR) indicators, the FBC technique significantly improved classification performance at a 77% accuracy for 0-back vs. 2-back and 83% for 0-back vs. 3-back using a public dataset. Moreover, topographic and heat-map visualisation indicated that the distinguishing regions for EEG and fNIRS showed a difference among the 0-back, 2-back and 3-back test results. It was determined that the best region to assist the discrimination of the mental workload for EEG and fNIRS is different. Specifically, the posterior area performed the best for the posterior midline occipital (POz) EEG in the alpha band and fNIRS had superiority in the right frontal region (AF8).en_UK
dc.identifier.citationCao J, Martin Garro E, Zhao Y. (2022) EEG/fNIRS Based workload classification using functional brain connectivity and machine learning, Sensors, Volume 22, Issue 19, October 2022, Article number 7623en_UK
dc.identifier.issn1424-8220
dc.identifier.urihttps://doi.org/10.3390/s22197623
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/18554
dc.language.isoenen_UK
dc.publisherMDPIen_UK
dc.rightsAttribution 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.subjectsensor fusionen_UK
dc.subjectmental workloaden_UK
dc.subjectn-backen_UK
dc.subjectartificial intelligenceen_UK
dc.subjectfeature engineeringen_UK
dc.titleEEG/fNIRS Based workload classification using functional brain connectivity and machine learningen_UK
dc.typeArticleen_UK

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