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Updated: Dec 30, 2025

Doppler Optical Coherence Tomography of Retinal Circulation
Published on: September 18, 2012
The Effect of Optical Flow Motion Direction on Vection Strength
Yoshitaka Fujii1, Takeharu Seno2
1Faculty of Design, Kyushu University, Fukuoka, Japan; Research Organization of Open Innovation and Collaboration, Ritsumeikan University, Osaka, Japan; Faculty of Humanities and Social Sciences, Kumamoto University, Kumamoto, Japan.
Abstract:
In some phenomena of visual perception, the motion direction of visual stimuli can affect perception. In particular, asymmetries between oblique directions and cardinal (horizontal and vertical) directions have been reported and are known as oblique effects (e.g., contrast sensitivity and motion threshold). In this study, we investigated how vection strength depends on motion direction. Participants observed random-dot optical flow in a circular field and rated the perceived vection strength. Dot movement was systematically controlled using the following angles: 0° (up), 30°, 45°, 60°, 90°, 120°, 135°, 150°, and 180° (down). We found that vection strength depended on motion direction and was weaker in the oblique directions than cardinal directions. Thus, the effect of motion direction on vection strength was variable, as seen in the shape of the oblique effect.
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