In online learning, little is known about the impact of mixed reality and its underlying socio-technological factors on social space perceived by learners. The term social space refers to a group's socio-emotional dynamics that structure the social relationships among its members. Drawing upon extant literature on mixed reality, interaction and social presence, this research proposes and validates a theoretical model that elucidates the influence of immersion on users’ social space experiences within digital environments across different mixed realities (i.e., augmented and virtual realities, and video conferencing). Interaction and social presence are identified as two key factors mediating this relationship. To test the proposed model, a survey involving 488 participants in higher education was conducted, and the effects were examined under three conditions: video conferencing, augmented-reality, and virtual-reality. The findings show that 1) an immersion perspective plays a significant role in educational technology, particularly for its role in facilitating social space among learners in higher education; 2) the impact of immersion on social space is entirely mediated by learners’ assessment of interactions and their perception of social presence in digitally facilitated learning environments; and 3) the influences of immersion on learners to experience a prosocial space vary across virtual reality, augmented reality, and video conferencing. VR environments offer the most pronounced sensation of social presence, while AR environments prove to be optimal for interacting in digitally facilitated learning environments. Out of these three conditions, VC environments were perceived the lowest for interaction, sensation of social presence, and the establishment of a communal atmosphere of collaboration in digitally mediated learning environments. These findings make valuable contributions to theory by providing insights into the influence of immersion and variability in mixed reality on learners’ perception of social space experiences. In this respect, this research expands the body of knowledge and research in both the information systems and education fields. Furthermore, this research offers valuable insights for educators to make informed decisions regarding the selection and adoption of augmented and virtual reality technologies, as well as devising digital strategies in higher education. It contributes to our understanding of effective implementation of mixed reality in this context. / Dissertation / Doctor of Philosophy (PhD)