Abstract: Disclosed is an audio-headset for acquisition of a bio-signal from a subject, including a first earpiece; a second earpiece; an arch connecting the first earpiece and the second earpiece; the arch including a hub (4); wherein the arch, the first earpiece and the second earpiece are configured so that the earpieces are placed over a subject's ears when the audio headset is worn by the subject; and at least one posterior branch (1) having a first end extending from the hub and a second free end; the at least one posterior branch (1) including a concave surface with a radius of curvature, a collapsed state when the headset is not worn by the subject and an expanded state when the headset is worn by the subject.

Abstract: Disclosed is an audio-headset for acquisition of a bio-signal from a subject, including a first earpiece; a second earpiece; an arch connecting the first earpiece and the second earpiece; the arch including a hub (4); wherein the arch, the first earpiece and the second earpiece are configured so that the earpieces are placed over a subject's ears when the audio headset is worn by the subject; and at least one posterior branch (1) having a first end extending from the hub and a second free end; the at least one posterior branch (1) including a concave surface with a radius of curvature, a collapsed state when the headset is not worn by the subject and an expanded state when the headset is worn by the subject.

Abstract: A headset for acquiring a bio-signal from a subject, includes a hub; at least 3 flexible branches, each branch having a first end extending from the hub and a second free end, the 3 flexible branches defining an opening formed by the relative position of the free ends; and at least 3 electrodes, wherein at least one electrode is located on each of the 3 flexible branches, the electrodes being configured for acquiring a bio-signal; the 3 flexible branches having a collapsed state; and an expanded state wherein the 3 electrodes are in contact with the scalp of the subject; and the headset is expanded from its collapsed state to its expanded state by placing the free ends on the top of the subject's head, and progressively lowering and sliding the same while contacting the scalp until the hub is contacted with the top of the head of the subject.