Abstract
When a short straight line segment moves across a zigzag line and is viewed in one's peripheral vision, it appears to exhibit nonrigid squirming motion (the squirm effect). This phenomenon demonstrates that the form, orientation, and motion direction of a short line are influenced by those of a longer one when they are viewed in one's peripheral vision.
Highlights
We observed that when a dot moves across a zigzag line and is viewed in one’s peripheral vision, the perceived motion path is biased toward the path of the zigzag line
Orientation of the zigzag line relative to the direction of motion (35 deg), the nonrigid impression was gradually replaced by a type of furrow illusion, i.e., the rigid short line segment tended to be seen to move along the zigzag line
Is the squirm effect a version of the slalom effect (Cesaro & Agostini, 1998)? We observed that when the short line segment was tracked by eye movements, the slalom effect was predominant, i.e., the motion path had a phase opposite to that of the zigzag wave
Summary
We call this nonrigid motion the squirm effect. We observed that when a dot moves across a zigzag line and is viewed in one’s peripheral vision, the perceived motion path is biased toward the path of the zigzag line. When the moving dot is replaced by a short line segment, the line segment is seen to move, squirming along the zigzag line.
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