Related Experiment Video
Updated: Jul 18, 2026

High-speed Particle Image Velocimetry Near Surfaces
Published on: June 24, 2013
Abstract:
Measurements of the perceived velocity of a drifting grating were obtained as a function of the position of the grating in the visual field. Identical drifting gratings were presented at the same eccentricity in the left, right, upper, and lower hemifields, and the perceived velocities were compared. A group of ten subjects considered together showed no significant hemifield differences in perceived velocity. However, some individual subjects showed marked and systematic hemifield differences, the directions of which varied among the subjects. There were no hemifield differences in susceptibility to adaptation to moving gratings.
Related Concept Videos
Velocity and Position by Graphical Method
Average and Instantaneous Velocity Vectors
Relative Velocity in One Dimension
Relative Velocity in Two Dimensions
Velocity and Acceleration in Steady and Unsteady Flow
The acceleration can be generalized to any point in the flow, and expressed as components along three perpendicular directions, representing changes in velocity over time.
Velocity Potential

