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A simple integrative method for presenting head-contingent motion parallax and disparity cues on Intel x86 processor-based machines

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image of Spatial Vision
For more content, see Multisensory Research and Seeing and Perceiving.

Rogers and Graham (1979) developed a system to show that head-movement-contingent motion parallax produces monocular depth perception in random dot patterns. Their display system comprised an oscilloscope driven by function generators or a special graphics board that triggered the X and Y deflection of the raster scan signal. Replication of this system required costly hardware that is no longer on the market. In this paper the Rogers-Graham method is reproduced with an Intel processor based IBM PC compatible machine with no additional hardware cost. An adapted joystick sampled through the standard game-port can serve as a provisional head-movement sensor. Monitor resolution for displaying motion is effectively enhanced 16 times by the use of anti-aliasing, enabling the display of thousands of random dots in real-time with a refresh rate of 60 Hz or above. A color monitor enables the use of the anaglyph method, thus combining stereoscopic and monocular parallax on a single display without the loss of speed. The power of this system is demonstrated by a psychophysical measurement in which subjects nulled head-movement-contingent illusory parallax, evoked by a static stereogram, with real parallax. The amount of real parallax required to null the illusory stereoscopic parallax monotonically increased with disparity.

Affiliations: 1: Laboratory of Vision Research, Department of Psychology, Rutgers University, Busch Campus, Piscataway, NJ 08854, USA

10.1163/156856897X00050
/content/journals/10.1163/156856897x00050
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/content/journals/10.1163/156856897x00050
1997-01-01
2016-12-05

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