Experiments on sensory-tonic field theory of perception: VI. Effect of position of head, eyes, and of object on position of the apparent median plane.

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Abstract
Two expts., were carried out to investigate (a) the effect of asymmetrically placed fixated objects and (b) the effect of head torsion and of eye-turning, on the position of the apparent median plane. The methodology of pointing to a place in space that appeared straight-ahead (apparent median plane) was used in both expts. It was found that position of the apparent median plane shifted in direction of fixated object, i.e., in direction of eye-turning; in contrast, with eyes closed, the position of the apparent median plane shifted opposite direction of horizontal eye-turning, and opposite direction of head torsion. These effects are interpreted to be analogous to those found previously for perception of verticality; the study therefore provides evidence for the generality of constructs used within the framework of sensory-tonic field theory.
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