A person moving through the world must be able to detect and identify moving objects to avoid collisions. In previous studies we examined how well people can detect a moving object within a radial optic flow field simulating observer motion. In this study, we are examining whether the addition of stereo cues would affect this ability. Observers view a radial flow field of 25 disks presented in stereo, consistent with observer motion in a straight line. All the disks are simulated to be at the same initial distance both by their speed and stereo disparity. In every trial a target circle moves at a speed deviation from this radial pattern. Observers used the keyboard to select whether they believed the disc that moved differently from the pattern was present or absent.
The demos consist of 3 trials each and originally were shown with 25 dots on a fuller screen. The dot size, and flow field size have been scaled down for viewing on the web and the absent condition is not included in the demo. The demo will show you conditions of the object moving .3, .5 and .9 of the speed times the rest of the discs for the slow condition and will show you 2, 1.5 and 1.1 times the speed of the rest of the discs for the fast condition. You can view the demos with red/green or red/blue stereo glasses by selecting the demo that corresponds to your glasses. |
