Binocular depth perception: Does head parallax help people see better in depth?

In this work we study the limits of stereoscopic depth perception on an observer tracking 3D display, which provides head parallax. We perform two experiments where human participants are asked to observe two random dot sinusoidal gratings and choose the less “groovy” one. We use gratings with various amplitude and lateral wavelength, and visualize them with and without head parallax. In each experiment we measure the error rate, decision time and head movements. We present comparative results, which show how these parameters are affected by the presence of head parallax.