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. Author manuscript; available in PMC: 2010 Mar 8.
Published in final edited form as: Vision Res. 2005 Jul;45(16):2177–2189. doi: 10.1016/j.visres.2005.02.006

Figure A1. Assumptions used in calculating estimated viewing distance and distance walked.

Figure A1

D is the real distance of the target ball at the start of the trial, θ is the angle between the line of sight to the ball at the start of the trial and the line of sight after walking laterally by distance x and β is the subject's bias. In (a), D′ is the estimated viewing distance of the target assuming x is judged correctly. In (b), x′ is the estimated distance walked assuming D is judged correctly. D′ and x′ are plotted in figure 9 for the conditions tested in experiment 2.