Subjective Tilt Angle

From EuroVR Knowledge Base

Description

The subjective tilt angle measure used by Hatada, Sakata and Kusaka (1980) is based on the idea of “unification of display and observer space”, which produces a feeling of seamless continuity under which the observer is presented with the information contained in the displayed picture. Objective, visually obtained information influences the condition of the observer’s subjective coordinate axis, which can be used as a measure of the sensation of reality. A participant is placed in front of a hemispherical glass-bead concave 180 screen, looking at it in a vertical position. Without a picture being shown, a tilted line target is presented to which the observer will adjust so that it will appear vertical. Still without a picture, the direction is determined at which the participant feels that the target line is vertical. The participant is shown a tilted picture for 15 seconds. The line target is shown again and it is determined at what tilt angle the observer feels the line is vertical. This is repeated several times. The difference between the subjectively vertical tilt angles of step 2 and 4 is the effect induced by the picture.

Primary Reference or Source

• Hatada, T., Sakata, H., & Kusaka, H. (1980). Psychophysical analysis of the sensation of reality. SMPTE Journal, 89, 560-569.