MECHANISMS INVOLVED IN VISUAL ORIENTATION CONSTANCY

Visual orientation judgments made during body tilt (E- and A-effects), during centrifugation (oculogravic effect), and following prolonged tilt (aftereffect) are interpreted in terms of visual orientation constancy. Data from 2 classes of experiments, those using labyrinthine-defective Ss and those involving different combinations of posture indicate that 3 systems are involved in orientation constancy. These are the vestibular otolith system and the proprioceptive system of the neck and trunk. Although the 3 systems are involved in the E-, A-, and oculogravic effects, adaptation of only the neck and trunk systems generates the aftereffect. (44 ref.) (PsycINFO Database Record (c) 2006 APA, all rights reserved). © 1969 American Psychological Association.