Abstract: Aspects of the present disclosure are directed to creating virtual doors within artificial reality (XR) universes for traversal within that XR universe and between other XR universes. Users can create virtual doors that control access to their privately owned property (e.g., world, parcel, house, etc.) in an XR universe. For example, an owner of a virtual door can manually lock the door to prevent any user from entering their property through the virtual door. As another example, an owner of a virtual door can configure door permissions and/or privacy settings that serve as heuristics by which a door access control manager determines whether to authorize a particular user, XR world, and/or XR universe to access. The XR universe traversal system can control an execution environment to smoothly transition between different applications, thereby enabling a user to traverse between different XR universes without having to leave the XR environment.

Abstract: Aspects of the present disclosure are directed to systems for capturing, recording, and playing back steps for building objects and structures in an artificial reality (XR) world. A teacher or creator can initiate a capture context within a build mode of an XR application, during which steps (and potentially other metadata) of a building process are recorded and stored. A XR world building engine can generate an interactive replay of the recorded building process that allows another user to view the building process within an XR environment at the user's preferred pace and/or from different perspectives. In some implementations, the XR world building engine can generate a replay of the teacher's or creator's avatar performing the building process, such that the user can view the building process from a third person perspective and perform the same steps to learn how to build objects and structures in an XR world.

Abstract: A method and apparatus for monitoring biosignals (e.g. bioelectrical signals) is disclosed. In one embodiment, a method and apparatus for anticipating a physiological abnormality (e.g. cardiac arrhythmia) is disclosed. In one embodiment, a method and apparatus moves into a high risk mode in anticipation of a physiological abnormality. In one embodiment, non-physiological risk factors may be derived from historic abnormalities (e.g. historic cardiac arrhythmia) of the user, another individual, or a population; and may be correlated with contemporary non-physiological data in order to anticipate a physiological abnormality.