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Abstract:
Abstract: Variable resolution displays were used to examine
the behavioral effects of presenting different resolutions to the
central and peripheral visual field during active visual search.
Participants were required to search through natural scenes and to
locate previously specified target objects. During search, the
visual display was updated in real-time using an eye tracker such
that a circular region centered on the point of gaze was presented
in high resolution. The surrounding region was presented in a lower
resolution that was adapted to the resolving power of peripheral
human vision. Size and resolution of central and peripheral regions
were varied. Visual search performance with variable resolution
displays was then compared to that with uniform high-resolution
displays. Measures of reaction time, accuracy, number of fixations,
and fixation durations for variable resolution displays
approximated those of high-resolution displays when the central
region radius was approximately 5 degrees despite the fact that
resolution in the periphery was degraded. These results suggest
that variable resolution displays, which require an order of
magnitude fewer computational resources to generate than uniform
resolution displays, provide a practical solution to
resource-limited virtual reality environments while maintaining
normal visual search performance.
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