A headset device (300, 600) for recording electrical activity of a subject's brain, comprising: an electrode assembly (380, 480, 500, 680, 710) comprising one or more body surface electrodes each configured to acquire an electrical signal present on a surface of a subject's head, the electrical signal being indicative of electrical activity present within a portion of the subject's brain; and a wearable electrode registration assembly that comprises configurable wire frame structures (322, 342), wherein the wearable electrode registration assembly is adapted to mate with the electrode assembly and the electrode assembly is adjustable relative to the wearable electrode registration assembly, the wearable electrode registration assembly having a front head engagement portion (324, 624) configured to engage with a location of the subject's head associated with the nose, wherein the wearable electrode registration assembly is configured such that when worn the location wherein the one or more body surface electrodes (382, 482, 582, 682) contacts the subject's head is generally fixed with respect to the location of the subject's nose, wherein the wearable electrode registration assembly comprises an anterior-to-posterior structure comprising a first configurable wire frame structure and engaging the nasion at the front of the head and the inion at the back of the head, and a transverse structure comprising a second configurable wire frame structure and engaging the root of the ear helix on both sides of the subject's head. an electrode assembly (380, 480, 500, 680, 710) comprising one or more body surface electrodes each configured to acquire an electrical signal present on a surface of a subject's head, the electrical signal being indicative of electrical activity present within a portion of the subject's brain; and a wearable electrode registration assembly that comprises configurable wire frame structures (322, 342), wherein the wearable electrode registration assembly is adapted to mate with the electrode assembly and the electrode assembly is adjustable relative to the wearable electrode registration assembly, the wearable electrode registration assembly having a front head engagement portion (324, 624) configured to engage with a location of the subject's head associated with the nose, wherein the wearable electrode registration assembly is configured such that when worn the location wherein the one or more body surface electrodes (382, 482, 582, 682) contacts the subject's head is generally fixed with respect to the location of the subject's nose, wherein the wearable electrode registration assembly comprises an anterior-to-posterior structure comprising a first configurable wire frame structure and engaging the nasion at the front of the head and the inion at the back of the head, and a transverse structure comprising a second configurable wire frame structure and engaging the root of the ear helix on both sides of the subject's head. an anterior-to-posterior structure comprising a first configurable wire frame structure and engaging the nasion at the front of the head and the inion at the back of the head, and a transverse structure comprising a second configurable wire frame structure and engaging the root of the ear helix on both sides of the subject's head.