The invention relates to a device (D4) with an intracorporeal current (Id) comprising means (IE2, OE2) for collecting an alternating signal (V2, Id2) according to a current (Id) having passed through all or part of the body of a subject. According to the invention, the device comprises means (10) for extracting from the AC signal a biological signal (BS) modulating the amplitude of the AC signal. L'invention concerne un dispositif (D4) à courant intracorporel (Id) comprenant des moyens (IE2, OE2) pour collecter un signal alternatif (V2, Id2) fonction d'un courant (Id) ayant traversé tout ou partie du corps d'un sujet. Selon l'invention, le dispositif comprend des moyens (10) pour extraire du signal alternatif un signal biologique (BS) modulant l'amplitude du signal alternatif.
