IPQ: Igroup Presence Questionnaire (measures presence; subscales: General Presence, Spatial Presence, Involvement, Experienced Realism)
SUS: Slater-Usoh-Steed Presence Questionnaire (6-item presence scale; distinct from System Usability Scale which shares the acronym)
SPES: Short Presence and Embodiment Scale
CSQ-VR: Cybersickness Questionnaire for Virtual Reality (subscales: Nausea, Disorientation, Sopite-Related)
IVBO: Illusion of Virtual Body Ownership scale
VEQ: Virtual Embodiment Questionnaire
EQ: Embodiment Questionnaire (Bhatt et al.)
SPS: Social Presence Scale
Humanness Index: Scale for assessing perceived humanness of virtual characters (used to measure uncanny valley effects)
6DoF: Six degrees of freedom: position (x, y, z) + rotation (pitch, yaw, roll)
I-DT: Dispersion-Threshold fixation detection algorithm
I-VT: Velocity-Threshold fixation detection algorithm
AOI: Area of Interest (defined region used in gaze data analysis)
OpenXR: Cross-platform, royalty-free API standard for VR/AR applications
OpenVR: Valve's open API for VR hardware (predecessor to OpenXR)
OSF: Open Science Framework (osf.io) — repository for pre-registration, data, and materials
AsPredicted: Lightweight pre-registration platform (aspredicted.org)
DUA: Data Use Agreement (governs controlled-access data sharing)
GDPR: General Data Protection Regulation (EU data privacy law)
HIPAA: Health Insurance Portability and Accountability Act (US health data law)