In this volume, originally published in 1978, the authors survey the historical and
contemporary research literature pertaining to two-dimensional visual-geometric illusions …

Recent research into the response properties of extrastriate visual cortical mechanisms has
revealed single-cell functional organisation which closely parallels certain global and …

Panoramic visual cues, as generated by the objects in the environment, provide the brain
with important information about gravity direction. To derive an optimal, ie, Bayesian …

Our visual environment is filled with an abundance of objects. When we see these objects,
our visual system initially processes their features in a parallel manner and then integrates …

Orientation illusions occur when the inducing figure is a line or grating (the tilt illusion) or a
square outline frame (the rod-and-frame illusion). In the range of inducing figure tilts …

Errors in vertical settings of a test rod occur when the rod is enclosed in a laterally-tilted
square-outline frame. The majority of previous experiments which have investigated this rod …

Using a printed configuration of a rod enclosed by a tilted frame, an orientation illusion
analog to the classical effect was obtained. In the first experiment it was shown that the …

Perceiving verticality is crucial for accurate spatial orientation. Previous research has
revealed that tilted scenes can bias verticality perception. Verticality perception bias can be …

In two studies the effect of the distance between the tip of the rod and the frame sides (gap)
in the rod-and-frame (RF) illusion was examined and the effect of a full-square condition was …

An important role for the near-effortless perception of bilateral symmetry in human (and
other) observers may well be to process the orientation of symmetrical or near-symmetrical …