Classification (of information) Biomedical signal processing 9 Feature extraction 7 Electroencephalography 5 electroencephalography 5 Cardiology 4 Decision trees 4 Deep learning 4 Electrophysiology 4 Extraction 4 feature extraction 4 Brain 3 Emotion recognition 3 Features extraction 3 Heart 3 Long short-term memory 3 Performance 3 Speech recognition 3 artificial intelligence 3 machine learning 3 Anomaly detection 2 Article 2 Behavioral research 2 Bi-directional 2 Bi-directional long short-term memory 2 Binary gray wolf optimizer 2 Brain computer interface 2 Convolution 2 Convolutional neural network 2 Diseases 2