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PLoS One DOI:10.1371/journal.pone.0044464

Characterization and robust classification of EEG signal from image RSVP events with independent time-frequency features.

Publication TypeJournal Article
Year of Publication2012
AuthorsMeng, J, Meriño, LMauricio, Shamlo, NBigdely, Makeig, S, Robbins, K, Huang, Y
JournalPLoS One
Date Published2012
KeywordsAlgorithms, Electroencephalography, Evoked Potentials, Humans, Models, Theoretical

UNLABELLED: This paper considers the problem of automatic characterization and detection of target images in a rapid serial visual presentation (RSVP) task based on EEG data. A novel method that aims to identify single-trial event-related potentials (ERPs) in time-frequency is proposed, and a robust classifier with feature clustering is developed to better utilize the correlated ERP features. The method is applied to EEG recordings of a RSVP experiment with multiple sessions and subjects.The results show that the target image events are mainly characterized by 3 distinct patterns in the time-frequency domain, i.e., a theta band (4.3 Hz) power boosting 300-700 ms after the target image onset, an alpha band (12 Hz) power boosting 500-1000 ms after the stimulus onset, and a delta band (2 Hz) power boosting after 500 ms. The most discriminant time-frequency features are power boosting and are relatively consistent among multiple sessions and subjects.Since the original discriminant time-frequency features are highly correlated, we constructed the uncorrelated features using hierarchical clustering for better classification of target and non-target images. With feature clustering, performance (area under ROC) improved from 0.85 to 0.89 on within-session tests, and from 0.76 to 0.84 on cross-subject tests. The constructed uncorrelated features were more robust than the original discriminant features and corresponded to a number of local regions on the time-frequency plane.

AVAILABILITY: The data and code are available at:


Alternate JournalPLoS ONE
PubMed ID23028544
PubMed Central IDPMC3445552