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

Perception - Tập 32 Số 6 - Trang 699-706 - 2003
Alexander N. Sokolov1, Marina A. Pavlova2
1Institut für Psychologie, Technische Universität Braunschweig, Spielmannstrasse 19, D 38106 Braunschweig, Germany
2Institut für Medizinische Psychologie und Verhaltensneurobiologie, MEG-Zentrum, and Entwicklungsneurologie, Kinderklinik, Universität Tübingen, Hoppe-Seyler-Strasse 1, D 72076 Tübingen, Germany

Tóm tắt

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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Perception

Tập 32 Số 6

699-706

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