Six experiments examined orientation-specific effects of stimulus context on the visual
perception of horizontal and vertical lengths: Using a paired-comparison method …

An experiment was performed which examined the role of figural orientation directly, and the
role of an inappropriately invoked size-constancy mechanism indirectly, in the actuation and …

The authors report on different methods to probe the structure of visually perceived surfaces
in 3 dimensions. The surfaces are specified by patterns of shading with Lambertian and …

In two experiments, subjects adjusted various pairings of the top and bottom boundaries of
two obliquely oriented outline bars (Experiment 1) and those of two similarly oriented …

292 NOTES AND DISCUSSIONS volves primarily the tilting and curvature of lines
concerned with static situations. The writer observed this summer an additional sp volving …

Judgments of slant, objective shape, and perspective shape were made under 6 stimulus
conditions: film-field, textured field, film-form against a homogeneous ground and against a …

A single line, eccentrically-located and roll-tilted-from-vertical within a frontal plane, induces
systematic changes in both the elevation of a target perceived to correspond to eye level …

A method for measuring the variation of one stimulus parameter with respect to another is
applied to show how line intensity affects the perceived tilt of lines, internal angle of …

Previous research has shown that not all segments of a square frame are necessary to
produce the illusory tilt of an enclosed vertical line. Indeed, the presence of a single tilted …

Three experiments were conducted to test the claim that the magnitude of the horizontal-
vertical illusion in an L figure varies as a function of which component is used as standard …