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Reference frames in early motion detection.

Authors
  • Morvan, Camille
  • Wexler, Mark
Type
Published Article
Journal
Journal of vision
Publication Date
Jan 01, 2005
Volume
5
Issue
2
Pages
131–138
Identifiers
PMID: 15831073
Source
Medline
License
Unknown

Abstract

To perceive the real motion of objects in the world while moving the eyes, retinal motion signals must be compensated by information about eye movements. Here we study when this compensation takes place in the course of visual processing, and whether uncompensated motion signals are ever available. We used a paradigm based on asymmetry in motion detection: Fast-moving objects are found easier among slow-moving distractors than are slow objects among fast distractors. By coupling object motion to eye motion, we created stimuli that moved fast on the retina but slowly in an eye-independent reference frame, or vice versa. In the 100 ms after stimulus onset, motion detection is dominated by retinal motion, uncompensated for eye movements. As early as 130 ms, compensated signals become available: objects that move slowly on the retina but fast in an eye-independent frame are detected as easily as those that move fast on the retina.

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