Depth in colour, a history of a chapter in physiologie optique amusante: Review

Two centuries ago, Goethe wrote in his Farbenlehre about blue as a receding colour, against yellow/red as a colour 'piercing into the organ'. Though any verification of these psychological attributes seems to be absent, this depth effect in colour still seems to be taken for granted in art history. In visual science, the completely different and...

Additive and subtractive transparent depth displays

Image fusion is the generally preferred method to combine two or more images for visual display on a single screen. We demonstrate that perceptual image separation may be preferable over perceptual image fusion for the combined display of enhanced and synthetic imagery. In this context image separation refers to the simultaneous presentation of...

A puzzling percept of stimulus stabilization

A visual illusion is reported which comprises the following: when a monitor with a moving constant velocity grating is swayed in front of a subject, the grating may be perceived as freezing or decelerating on the screen. This percept appears to depend on the magnitude and direction of the retinal grating velocity, relative to that of the moni...

An acceleration illusion caused by underestimation of stimulus velocity during pursuit eye movements: Aubert-Fleischl revisted

When the eyes pursue a fixation point that sweeps across a moving background pattern, and the fixation point is suddenly made to stop, the ongoing motion of the background pattern seems to accelerate to a higher velocity. Experiment I showed that this acceleration illusion is not caused by the sudden change in (i) the relative velocity between...