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  • Title: Imagined body orientation and perception of the visual vertical.
    Author: Mertz S, Lepecq JC.
    Journal: Psychol Res; 2001; 65(1):64-70. PubMed ID: 11505616.
    Abstract:
    The existence of body orientation mental imagery was tested by examining whether self roll tilt imagery affects the subjective visual vertical (SVV). Twenty healthy subjects judged the orientation of a dim luminous bar with respect to gravitational vertical, while normally seated in complete darkness with their head firmly restrained earth vertically. SVV was measured in three conditions: a reference condition with no imagery, and a left and a right imagery condition, during which the bar orientation was to be judged while the subjects imagine themselves roll-tilted towards left or right, respectively. The imagined roll tilts were of the same magnitude as roll tilts which generally induce an E-effect, i.e., an SVV lean toward the side opposite to those of body tilt. If imagery and perception of self roll tilt share common processes, self roll tilt imagery should induce an E-like effect. Results show an imagery-induced E-like effect, which strongly supports the idea that humans can perform mental imagery of body orientation about gravity.
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