Page 142 - Read Online

Li et al. Soft Sci 2023;3:22 https://dx.doi.org/10.20517/ss.2023.11 Page 5 of 15

Figure 1. Design of our VR-EEG headset. (A) A schematic illustration of the PMA sponge electrodes integrated on a commercial VR
headset to make good contact with the hairy scalp for EEG. The blue dash lines labeled on the VR headset strap indicate the outline of
the FCA laminated on the other side of the strap; (B) A photograph of the PMA sponge electrodes; (C) A photograph of the FCA that
connects all sponge electrodes to the back of the VR headset for connection to the data acquisition system; (D) An exploded view
illustrating the installation of one PMA sponge on the VR headset through insertion into the open holes of the FCA, which is adhered to
the strap by a double-sided elastomeric sticker; (E) The VR headset with nine PMA sponge electrodes integrated on it. EEG:
electroencephalography; FCA: flexible connector array; PMA: poly (3,4-ethylenedioxythiophene) polystyrene sulfate/melamine;
VR:virtual reality.

stable integration. The topside of the connectors and traces are insulated with Kapton tape to prevent direct
copper-skin contact. The connector has an inner diameter of 10 mm, slightly smaller than that of the
sponge, allowing it to deform and fit snugly into the connector hole for a secure connection. The FCA was
fabricated using a laser cutting process [Supplementary Figure 1] , and the details of the fabrication process
are provided in the supporting information. A 1 mm-thick elastomer double-sided sticker was utilized to
further secure the sponge electrodes to the VR headset straps, providing stability under shear force
[Figure 1D]. Figure 1E displays the VR headset equipped with nine integrated sponge electrodes, which is
ready to be worn by the user for simultaneous EEG recording and VR display.