Volume 5, Number 2, Article 4, Pages 131-138 doi:10.1167/5.2.4 http://journalofvision.org/5/2/4/ ISSN 1534-7362
Reference frames in early motion detection
Camille Morvan
LPPA, CNRS, Collège de France, Paris, France
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Mark Wexler
LPPA, CNRS, Collège de France, Paris, France
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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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History
Received September 22, 2004; published February 23, 2005
Citation
Morvan, C., & Wexler, M. (2005). Reference frames in early motion detection. Journal of Vision, 5(2):4, 131-138, http://journalofvision.org/5/2/4/, doi:10.1167/5.2.4.
Keywords
motion detection, spatial constancy, reference frames, smooth pursuit, compensation, visual search
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