Jan 25, 2020

The Effect of Optical Flow Motion Direction on Vection Strength

I-Perception
Yoshitaka Fujii, Takeharu Seno

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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Mentioned in this Paper

Perception
Visual Perception
Cardinal Direction
Direction
Participant
Circular
Optic Flow
Horizontal
Shapes
Asymmetry

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