BCI CSP EEG Electrocardiogram (ECG) Emfit FBCSP (filter bank common spatial pattern) Humanities LC sensor Riemannian geometry Seismocardiography (SCG) Social interaction acceleration accelerometers acoustic emissions adaptive recursive least squares filter (ARLSF) ageing ballistocardiogram ballistocardiography blood pressure body sensor network capacitive sensors cardiac mechanics cardiac output compression therapy consumer-wearable devices electro-oscillography (EOG) electrocardiogram expertise feature engineering flexible sensors