When two parallel gratings moving at the same speed are presented simultaneously, the
lower-contrast grating appears slower. This misperception is evident across a wide range of …

International Series of Monographs in Experimental Psychology, Volume 16: Aspects of
Motion Perception details the fundamental concepts of the visual system perception of …

Differential velocity detection in the fovea was used to probe the properties of a local motion
mechanism. Human observers can detect differences in velocity of less than 5% even for a …

Two experiments were conducted to explore the potential effects of aging upon the
perception and discrimination of speed. In the first experiment, speed difference thresholds …

Now available in paperback. This revised and updated edition of the definitive resource for
experimental psychology offers comprehensive coverage of the latest findings in the field, as …

It has been known for some 40 years that the perceived velocity of a moving object does not
correspond to its physical velocity. It is also known that the perceived length and temporal …

Two experiments examined the discriminability of moving gratings. Experiment 1 measured
the difference between detection and discrimination thresholds for gratings of equal spatial …

The ability to use trajectory forms as visual information about events was tested. A trajectory
form is defined as the variation in velocity along a path of motion. In Experiment 1, we tested …

Gordon Lynn Walls, a comparative anatomist, observed:“If asked what aspect of vision
means the most to them, a watchmaker may answer 'acuity,'a night flier 'sensitivity', and an …

Intended for special education and physical education teachers, the handbook presents
selected developmental sequences of activities based on the analysis of perceptual motor …