Jan 1, 1994

The contribution of motion, the visual frame, and visual polarity to sensations of body tilt

Perception
I P Howard, L Childerson

Abstract

Three types of visual information contribute to the sense of self orientation with respect to gravity: visual polarity of objects with a distinct top and bottom, the principal vertical and horizontal lines of the visual environment, and visual motion. Three visual displays were designed to investigate the contribution of each visual feature to illusory self tilt: a large sphere lined with dots, a cubic room lined with dots, and a furnished room with floor and ceiling. In experiment 1 the dotted room and the furnished room were tilted to various angles about the roll axis of the erect subject who set a visual line and an unseen rod to the apparent vertical. In the dotted room, settings were made either with respect to the nearest surface to the horizontal or with respect to the nearest diagonal of the room. In the furnished room, settings were made with respect to the nearest horizontal wall but not with respect to diagonals. In experiment 2 each of the three displays was rotated at constant velocity and subjects' responses were classified into four categories: illusory self tilt at a constant angle, alternating self tilt with the body becoming erect each time a surface became horizontal, continuous head-over-heels self rotation...Continue Reading

Mentioned in this Paper

Pattern Recognition, Visual
Field Dependence-Independence
Kinesthesis
Postural Balance
Motion Perception
Tilt (brand of fungicide)
Visual Displays
Esthesia
Mental Concentration
Optical Illusions

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