Pupillary Light Reflex Correction for Robust Pupillometry in Virtual Reality

Virtual reality (VR) headsets with an integrated eye tracker enable the measurement of pupil size fluctuations correlated cognition during a VR experience. We present method to correct for light-induced changes, otherwise masking more subtle cognitively-driven effects, such as cognitive load and emotional state. explore multiple calibration sequences find individual mapping functions relating luminance dilation that can be employed in real-time The resulting are evaluated VR-based n-back task free exploration six-degrees-of-freedom scene. Our results show estimating from weighted average fixation area background yields best performance. Calibration sequence composed either solid gray or realistic scene brightness levels shown 6 s pseudo-random order proved most robust.