Wearable augmentative and alternative communication (wAAC): a novel solution for people with complex communication needs

Communication is a vital skill of a human's life. People with different types of disabilities may have Complex Communication Needs and may need a wearable device to help them to communicate. Augmentative and Alternative Communication (AAC) is a term which refers to the methods of facilitating or replacing people's communication abilities. Brain-computer interfaces (BCI) and Eye-Gaze Technology (EGT) are two widely used access technologies in AAC devices. However, there are only a few studies that have investigated the utilisation of these technologies in a Virtual Reality (VR) or Augmented Reality (AR) environment. VR and AR are both modern technologies which provide immersive environments. In addition, the Mixed Reality (MR) environment combines virtual reality with real life and may offer extra benefits such as better immersion, better interaction, and more information. This paper proposed an MR-based wearable AAC device and compared the usability and acceptability between its Eye-Gaze (EG) and BCI interaction options. Eight neurotypical participants and two participants with cerebral palsy participated. The result showed high usability (accuracy = 93.30%, the information transfer rate was 8.55 selections per minutes) and acceptability (QUEST 2.0 = 4.30, NASA-TLX = 2.14) in the EG session. In contrast, the usability of the BCI system in the current design was questionable. This novel interaction method using Electroencephalogram signals is not sufficiently exploited at the moment, and more research is suggested in the future.