Biosignal

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Biosignal is a summarizing term for all kinds of signals that can be (continually) measured and monitored from biological beings. The term biosignal is often used to mean bio-electrical signal but in fact, biosignal refers to both electrical and non-electrical signals.

Electrical biosignals ("bio-electrical" signals) are usually taken to be (changes in) electrical currents produced by the sum of electrical potential differences across a specialized tissue, organ or cell system like the nervous system. Thus, among the best-known bio-electrical signals are the

Electroencephalogram (EEG)
Magnetoencephalogram (MEG)
Galvanic skin response (GSR)
Electrocardiogram (ECG)
Electromyogram (EMG)
Heart Rate Variability (HRV)

Electrical currents and changes in electrical resistances across tissues can also be measured from plants.

Bio-signals may also refer to any non-electrical signal that is capable of being monitored from biological beings, such as mechanical signals (e.g. the mechanomyogram or MMG), acoustic signals (e.g. phonetic and non-phonetic utterances, breathing) and visual signals (e.g. movements).