Researchers Exploit, Saccadic Suppression, Natural Quirk of Human Vision for Hidden Redirected Walking in VR
There’s a number of ways to implement redirected walking, but the strengths of this saccade-driven method is that it’s hidden from the user, widely applicable to VR content, and dynamic, allowing the system to direct users away from objects newly introduced into the environment, and even moving objects, the researchers say.
The basic principle behind their work is an exploitation of a natural quirk of human vision—saccadic suppression—to hide small rotations to the virtual scene. Saccades are quick eye movements which happen when we move our gaze from one part of a scene to another. Instead of moving in a slow continuous motion from one gaze point to the next, our eyes quickly dart about, when not tracking a moving object or focused on a singular point, a process which takes tens of milliseconds.
Saccadic suppression occurs during these movements, essentially rendering us blind for a brief moment until the eye reaches its new point of fixation. With precise eye-tracking technology from SMI and an HTC Vive headset, the researchers are able to detect and exploit that temporary blindness to hide a slight rotation of the scene from the user. As the user walks forward and looks around the scene, it is slowly rotated, just a few degrees per saccade, such that the user reflexively alters their walking direction in response to the new visual cues.
See the full story here: https://www.roadtovr.com/researchers-exploit-natural-quirk-of-human-vision-saccade-hidden-redirected-walking-vr-gtc-2018/