Affiliations:
Computer Science and Engineering Department, NIT Silchar, Silchar, Assam, India
Correspondence:
[*]
Corresponding author. Rajdeep Ghosh, Computer Science and Engineering Department, NIT Silchar, Silchar 788010, Assam, India. E-mail: [email protected].
Abstract: Brain Computer Interface (BCI) enables us to record and process the information generated by the brain and process them. Due to high variability of the Electroencephalogram (EEG) data, multiple trails are recorded for a particular task. The present work aims to improve the accuracy for motor imagery task classification by selecting the most prominent trail from the multiple trails recorded during motor imagery. In this paper, we propose a novel weight optimization algorithm for common spatial filtering (CSP) using evolutionary algorithms (i.e. cuckoo search algorithm (CSA), firefly algorithm (FA) and gravitational search algorithm (GSA)) to select the most prominent trial from the multiple trails recorded for feature extraction. The features extracted from the selected trials were thus used for motor imagery task classification. The performance was evaluated on the extracted features from the selected trials using two classifiers namely linear discriminant analysis (LDA) and support vector machines (SVM). It is observed that FA with band power as a feature gives the best performance in comparison to the earlier reported methods i.e. average, error based and alternating direction method of multipliers (ADMM).
Keywords: Brain computer interface, common spatial pattern, cuckoo search algorithm, electroencephalography, firefly algorithm, gravitational search algorithm, linear discriminant
analysis, support vector machine
