Timing accuracy in motion extrapolation: reverse effects of target size and visible extent of motion at low and high speeds.

Abstract:

: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.

journal_name

Perception

journal_title

Perception

authors

Sokolov A,Pavlova M

doi

10.1068/p3397

keywords:

subject

Has Abstract

pub_date

2003-01-01 00:00:00

pages

699-706

issue

6

eissn

0301-0066

issn

1468-4233

journal_volume

32

pub_type

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