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Cognitive workload modulation through degraded visual stimuli: a single-trial EEG study.

Cognitive workload modulation through degraded visual stimuli: a single-trial EEG study.

Authors: 
Yu K, Prasad I, Mir H, Thakor N, Al-Nashash H.
Year: 
2015
Journal: 
J. Neural Eng.
Abstract: 

OBJECTIVE: Our experiments explored the effect of visual stimuli degradation on cognitive workload.

APPROACH: We investigated the subjective assessment, event-related potentials (ERPs) as well as electroencephalogram (EEG) as measures of cognitive workload.

MAIN RESULTS: These experiments confirm that degradation of visual stimuli increases cognitive workload as assessed by subjective NASA task load index and confirmed by the observed P300 amplitude attenuation. Furthermore, the single-trial multi-level classification using features extracted from ERPs and EEG is found to be promising. Specifically, the adopted single-trial oscillatory EEG/ERP detection method achieved an average accuracy of 85% for discriminating 4 workload levels. Additionally, we found from the spatial patterns obtained from EEG signals that the frontal parts carry information that can be used for differentiating workload levels.

SIGNIFICANCE: Our results show that visual stimuli can modulate cognitive workload, and the modulation can be measured by the single trial EEG/ERP detection method.

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