Heading direction is significantly biased by preceding whole-body roll-orientation while lying
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18.04.2022
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01A - Journal article
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Frontiers in Neurology
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13
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Frontiers
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Abstract
Background: After a prolonged static whole-body roll-tilt, a significant bias of the internal estimates of the direction of gravity has been observed when assessing the subjective visual vertical.
Objective: We hypothesized that this post-tilt bias represents a more general phenomenon, broadly affecting spatial orientation and navigation. Specifically, we predicted that after the prolonged roll-tilt to either side perceived straight-ahead would also be biased.
Methods: Twenty-five healthy participants were asked to rest in three different lying positions (supine, right-ear-down, and left-ear-down) for 5 min (“adaptation period”) prior to walking straight-ahead blindfolded for 2 min. Walking was recorded with the inertial measurement unit sensors attached to different body locations and with sensor shoe insoles. The raw data was segmented with a gait–event detection method. The Heading direction was determined and linear mixed-effects models were used for statistical analyses.
Results: A significant bias in heading into the direction of the previous roll-tilt position was observed in the post-adaptation trials. This bias was identified in both measurement systems and decreased again over the 2-min walking period.
Conclusions: The bias observed further confirms the influence of prior knowledge on spatial orientation and navigation. Specifically, it underlines the broad impact of a shifting internal estimate of direction of gravity over a range of distinct paradigms, illustrating similar decay time constants. In the broader context, the observed bias in perceived straight-ahead emphasizes that getting up in the morning after a good night's sleep is a vulnerable period, with an increased risk of falls and fall-related injuries due to non-availability of optimally tuned internal estimates of the direction of gravity and the direction of straight-ahead.
Keywords
prior knowledge, patial orientation and navigation, post-tilt bias, perceived straight-ahead, inertial measurement unit, sensor shoe insoles
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1664-2295
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English
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Yes
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Published
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Gold
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Citation
Tarnutzer, A. A., Duarte da Costa, V., Baumann, D., & Hemm-Ode, S. (2022). Heading direction is significantly biased by preceding whole-body roll-orientation while lying. Frontiers in Neurology, 13. https://doi.org/10.3389/fneur.2022.868144