Fig. 5
From: The effect of long-term exposure to microgravity on the perception of upright
The size of the visual effect for each astronaut (a, lower panel) and ground control (b, lower panel) is compared to the effect that would be predicted if the relative weights of vision and body remained constant (upper panels). The gray shaded region indicates the measurements taken in space (or at equivalent times for the controls). FLTE and FLTL refer to measurements taken early (9–14 days) and late (77–190 days) in flight, or at the equivalent times (FLT 1 and FLT 5) for the controls. The three-vector model is shown diagrammatically in c to illustrate the predicted effect of removing the gravity cue (top)
