Three-Dimensional Visuospatial Memory in Humans

Arash Yazdanbakhsh¹, Celi Gagliardi²
¹Boston University, ²Boston University

Recent technology has given rise to three-dimensional (3D) televisions that immerse observers in 3D virtual realities (VR). This technology can be used to test human 3D visuospatial memory: the ability to remember the position of objects seen in space. However, few studies have tested this without context to fixed objects. In this study, a VR was created with an aluminum screen, a 120 Hz projector, a polarizing filter, and 3D glasses. Disparity and size cues induced depth perception. First, we measured the participant’s ability to perceive depth from disparity and then placed the observer in a VR with 5000 small dots distributed in depth, height, and azimuth that made up a dot field. Participants memorized the 3D positions of a target that appears for three to five seconds. The target then jumped to a randomized location within the dot field. Participants then repositioned the target back to its initial position. The dot field was redistributed each time the target was moved. Analyses show that the greatest errors in repositioning were along the line of sight in depth. The spread of error was invariant against target distance, suggesting that visuospatial memory was not affected by the depth range in our experiment. The repositioning of targets on a horizontal (coronal) plane showed that nearer targets are perceived lower than father ones.

Keywords: Visuospatial, Memory, 3D Vision

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