Modulation of internal estimates of gravity during and after prolonged roll-tilts.

Errors at the beginning of the post-tilt period were a precise predictor of the post-tilt drift amplitude, as shown by the highly significant correlation ( Figure 9 , panel A) between these two parameters (R 2 = 0.83, slope = -1.00, 95% CI = -1.10 to -0.90), indicating that subjects successfully restored the original pre-tilt percept of vertical within 5 minutes after returning to upright position.

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