Systems, methods and wearable devices associated with mind/brain-computer interfaces are disclosed. Embodiments herein include features related to one or more of optical-based brain signal acquisition, decoding modalities, encoding modalities, brain-computer interfacing, AR/VR content interaction, signal to noise ration enhancement, and/or motion artefact reduction, among other features set forth herein. Certain implementations may include or involve processes of collecting and processing brain activity data, such as those associated with the use of a brain-computer interface that enables, for example, decoding and/or encoding a user's brain functioning, neural activities, and/or activity patterns associated with thoughts, including sensory-based thoughts. Further, the present systems and methods may be configured to leverage brain-computer interface and/or non-invasive wearable device aspects to provide enhanced user interactions for next-generation wearable devices, controllers, and/or other computing components based on the human thoughts, brain signals, and/or mind activity that are detected and processed.