The term ‘biosignal’ is defined as any signal measured and monitored from a biological being, although it is commonly used to refer to an electrical biosignal. Electrical biosignals (bio-electrical signals) are the electrical currents generated by electrical potential differences across a tissue, organ or cell system like the nervous system.
Typical bio-electrical signals are ECG (Electrocardiogram), EMG (Electromyogram), EEG (Electroencephalogram) and EOG (Electrooculogram). GSR (Galvanic skin response) and HRV (Heart rate variability) are also thought of as bio-electrical signals, although they are not measured directly from electrical potential differences.

 

ECG (Electrocardiogram)

 

EEG (Electroencephalogram)

EMG (Electromyogram)

 

 

EOG (Electrooculogram)

GSR (Galvanic skin response)

HRV (Heart rate variability)