FIGURE 2.

Head‐tilt perception (HTP) results and illustration of experimental variables. A, HTP was calculated as the difference between the head roll‐tilt angle (HTA) and the subjective visual vertical (SVV) in all experiments. B, The average HTPs vs the average HTAs in preliminary experiments 1 (□; n = 7) and 2 (■; n = 66), superimposed. C, Representative individual data from the principal experiment. The HTP gain (HTPG) is the slope of the regression line fitted to the left or right head‐tilt data (solid and dotted lines, respectively). Left HTPG, 0.984; right HTPG, 1.025