Modulation of Internal Estimates of Gravity during and after Prolonged Roll-Tilts

Alexander A Tarnutzer, Giovanni Bertolini, Christopher J Bockisch, Dominik Straumann and Sarah Marti

PLOS ONE, 2013, vol. 8, issue 10, 1-

Abstract: Perceived direction of gravity, as assessed by the subjective visual vertical (SVV), shows roll-angle dependent errors that drift over time and a bias upon return to upright. According to Bayesian observer theory, the estimated direction of gravity is derived from the posterior probability distribution by combining sensory input and prior knowledge about earth-vertical in a statistically optimal fashion. Here we aimed to further characterize the stability of SVV during and after prolonged roll-tilts. Specifically we asked whether the post-tilt bias is related to the drift pattern while roll-tilted. Twenty-nine healthy human subjects (23-56yo) repetitively adjusted a luminous arrow to the SVV over periods of 5min while upright, roll-tilted (±45°, ±90°), and immediately after returning to upright. Significant (p

Date: 2013
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Persistent link: https://EconPapers.repec.org/RePEc:plo:pone00:0078079

DOI: 10.1371/journal.pone.0078079

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