What does the Ternus Display Tell us about Motion Processing in Human Vision?

Nicholas E Scott-Samuel; Robert F Hess

doi:10.1068/p3247

What does the Ternus Display Tell us about Motion Processing in Human Vision?

Perception ◽

10.1068/p3247 ◽

2001 ◽

Vol 30 (10) ◽

pp. 1179-1188 ◽

Cited By ~ 18

Author(s):

Nicholas E Scott-Samuel ◽

Robert F Hess

Keyword(s):

Human Vision ◽

Motion Processing ◽

Ternus Display

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What does the Ternus display tell us about motion processing in human vision?

Journal of Vision ◽

10.1167/1.3.156 ◽

2010 ◽

Vol 1 (3) ◽

pp. 156-156

Author(s):

N. E. Scott-Samuel ◽

R. F. Hess

Keyword(s):

Human Vision ◽

Motion Processing ◽

Ternus Display

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Timing Accuracy in Motion Extrapolation: Reverse Effects of Target Size and Visible Extent of Motion at Low and High Speeds

Perception ◽

10.1068/p3397 ◽

2003 ◽

Vol 32 (6) ◽

pp. 699-706 ◽

Cited By ~ 9

Author(s):

Alexander Sokolov ◽

Marina Pavlova

Keyword(s):

Absolute Error ◽

Human Vision ◽

Target Size ◽

Motion Processing ◽

Timing Accuracy ◽

Low Speed ◽

Motion Extrapolation ◽

High Speeds ◽

Processing Mechanisms ◽

Scaling Algorithms

By varying target size, speed, and extent of visible motion we examined the timing accuracy in motion extrapolation. Small or large targets (0.2 or 0.8 deg) moved at either 2.5, 5, or 10 deg s−1 across a horizontal path (2.5 or 10 deg) and then vanished behind an occluder. Observers responded when they judged that the target had reached a randomly specified position between 0 and 12 deg. With higher speeds, the timing accuracy (the reverse of absolute error) was better for small than for large targets, and for long than for short visible extents. With low speed, these effects were reversed. In addition, while long visible extents yielded a greater accuracy at high than at low speeds, for short extents the accuracy was much better with the low speed. The findings suggest that, when extrapolating motion with targets and visible extents of different sizes, the visual system implements different scaling algorithms depending on target speed. At higher speeds, processing of visible and occluded motion is likely to share a common scaling mechanism based on velocity transposition. Reverse effects for target size and extent of visible motion at low and high speeds converge with the assumption of two distinct speed-tuned motion-processing mechanisms in human vision.

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