Starting position, adaptation, and visual framework as influencing the perception of verticality.

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Abstract
Using an electrically controlled rod and frame apparatus, 16 Ss were exposed to various conditions of tilts of the rod alone, frame alone, and rod and frame together. Increased exposure time resulted in increased shifts in the position of apparent vertical in the rod alone and frame alone conditions but not in the rod and frame together conditions. Aftereffects measured on the rod alone, after viewing the rod and frame together, were found equivalent to those obtained after viewing the rod alone. This finding was supported in a 2nd experiment using longer exposure periods. 2 different mechanisms must be postulated to explain these effects. (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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