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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\u2019s communication abilities. Brain\u2013computer 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\u00a0=\u00a093.30%, the information transfer rate was 8.55 selections per minutes) and acceptability (QUEST 2.0\u00a0=\u00a04.30, NASA-TLX\u00a0=\u00a02.14) 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.<\/jats:p>","DOI":"10.1007\/s10055-023-00818-8","type":"journal-article","created":{"date-parts":[[2023,6,19]],"date-time":"2023-06-19T08:02:41Z","timestamp":1687161761000},"page":"2441-2459","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Wearable augmentative and alternative communication (wAAC): a novel solution for people with complex communication needs"],"prefix":"10.1007","volume":"27","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-4234-5894","authenticated-orcid":false,"given":"Haifeng","family":"Zhao","sequence":"first","affiliation":[]},{"given":"Petra","family":"Karlsson","sequence":"additional","affiliation":[]},{"given":"Darryl","family":"Chiu","sequence":"additional","affiliation":[]},{"given":"Carter","family":"Sun","sequence":"additional","affiliation":[]},{"given":"Omid","family":"Kavehei","sequence":"additional","affiliation":[]},{"given":"Alistair","family":"McEwan","sequence":"additional","affiliation":[]}],"member":"297","published-online":{"date-parts":[[2023,6,19]]},"reference":[{"issue":"4","key":"818_CR1","doi-asserted-by":"crossref","first-page":"463","DOI":"10.1586\/17434440.4.4.463","volume":"4","author":"BZ Allison","year":"2007","unstructured":"Allison BZ, Wolpaw EW, Wolpaw JR (2007) Brain-computer interface systems: progress and prospects. 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NT03 was the author AM. NT06 was the author DC. The authors have no other conflicts of interest to declare. All co-authors have seen and agree with the contents of the manuscript and there is no financial interest to report. We certify that the submission is original work and is not under review at any other publication.","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Conflict of interest"}},{"value":"The ethics were approved by the Human Ethics Committee at the University of Sydney. The project number of the approval was 2021\/481.","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethical approval"}},{"value":"All consents were approved, and physical forms were signed by the participants prior to the experiments.","order":4,"name":"Ethics","group":{"name":"EthicsHeading","label":"Consent to participate"}},{"value":"All the data published in this paper were declared in the consent forms and consented to by the participants.","order":5,"name":"Ethics","group":{"name":"EthicsHeading","label":"Consent for publication"}}]}}