Matching Image Update Rates in Gaze-Contingent Multi-Resolutional Displays to the Temporal Limits of Vision
Another key question for designers of gaze-contingent
multi-resolutional displays is regarding how fast you need to update
the center of highest resolution each time the viewer moves their eyes.
If this updating is too slow, it may cause perceptual difficulties. We
have conducted several studies this issue, to identify deadlines for
image updating that do not interfere with perception. An initial study
(McConkie & Loschky, 2002) determined the earliest point in an eye
fixation when image blur becomes detectable, which is 6 milliseconds
after the eye has stopped moving. However, a 6 ms update delay deadline
is overly conservative for use in gaze-contingent multi-resolutional
displays. Two follow-up studies (Loschky, in preparation; Loschky &
McConkie, in press) have found that longer delays can be used with
causing perception and performance difficulties. Loschky and McConkie
(in press) have shown that delays of up to 60 ms do not increase the
detectability of just-noticeable blur. Another study with more
detectable blur (Loschky, in preparation) found that a 45 ms delay
slightly increased eye fixation durations, but did not increase search
times for targets in natural scenes. These studies provide critical
information for designers of gaze-contingent multi-resolutional display
applications.
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