A headset comprising: an elongate body member sufficiently long to encircle the head of a user, said elongate body member having a closed state and a rest state; a closure mechanism associated with ends of said body member, said closure mechanism having an open state and a closed state, wherein said body member is in said rest state when said closure mechanism is in said open state and said body member is in said closed state and forms said circumferential headset when said closure mechanism is in said closed state; and at least one electrode or at least one sensor, mounted on said body member, configured, when said headset is donned on a user's head, to be positioned against the skin of the head of said user, and electrically communicating with a processing unit, said headset being characterized in that : said body member comprises at least one posterior member , said at least one posterior member being at least semi-rigid and terminating in a tapered end to which is connected said closure mechanism , said tapered end tapering from a first portion having a first width to a second portion having a second width, smaller than said first width, said at least one posterior member being configured, to plow between hair to access the scalp of said user, during donning of said headset, such that when said headset is donned, said at least one electrode or said at least one sensor is in at least one of direct physical contact and direct electrical contact with said scalp of said user. an elongate body member sufficiently long to encircle the head of a user, said elongate body member having a closed state and a rest state; a closure mechanism associated with ends of said body member, said closure mechanism having an open state and a closed state, wherein said body member is in said rest state when said closure mechanism is in said open state and said body member is in said closed state and forms said circumferential headset when said closure mechanism is in said closed state; and at least one electrode or at least one sensor, mounted on said body member, configured, when said headset is donned on a user's head, to be positioned against the skin of the head of said user, and electrically communicating with a processing unit, said headset being characterized in that : said body member comprises at least one posterior member , said at least one posterior member being at least semi-rigid and terminating in a tapered end to which is connected said closure mechanism , said tapered end tapering from a first portion having a first width to a second portion having a second width, smaller than said first width, said at least one posterior member being configured, to plow between hair to access the scalp of said user, during donning of said headset, such that when said headset is donned, said at least one electrode or said at least one sensor is in at least one of direct physical contact and direct electrical contact with said scalp of said user. said body member comprises at least one posterior member , said at least one posterior member being at least semi-rigid and terminating in a tapered end to which is connected said closure mechanism , said tapered end tapering from a first portion having a first width to a second portion having a second width, smaller than said first width, said at least one posterior member being configured, to plow between hair to access the scalp of said user, during donning of said headset, such that when said headset is donned, said at least one electrode or said at least one sensor is in at least one of direct physical contact and direct electrical contact with said scalp of said user. <EOS>