Tuck V L, Welchman A E, Harris J M, 2002, "Detection of motion in depth: poor motion thresholds using LCD stereogoggles" Perception 31 ECVP Abstract Supplement
Detection of motion in depth: poor motion thresholds using LCD stereogoggles
V L Tuck, A E Welchman, J M Harris
3-D motion can be generated on a 2-D computer monitor by presenting different motion signals to each eye. Two techniques for stereoscopic motion presentation are widely used: stereogoggles (present alternate frames in the motion sequence to each eye) and the mirror stereoscope (directs different images to the left and right eyes). Our aim was to determine whether observer responses to real-world 3-D motion are comparable to their responses to computer-generated motion when using the two different presentation techniques. Observers undertook a direction-discrimination task. For the real-world task, we moved an LED backwards and forwards in depth relative to a stationary fixation point. Ray tracing was used in the computer tasks to generate the same pattern of motion across the retinas as in the real-world task. Probit analysis was applied to the data in order to determine thresholds. We found that thresholds for computer-generated motion viewed through stereogoggles were up to ten times higher than thresholds for real-world motion. Thresholds for motion viewed through the mirror stereoscope were similar to real-world thresholds. We suggest that the temporally interleaved presentation of motion associated with stereogoggles may have raised thresholds in this task.
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