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. 2005 Jan 12;102(3):939–944. doi: 10.1073/pnas.0408444102

Fig. 1.

Fig. 1.

Illustration of the basic experimental stimulus. (a) Observers adjusted the position and orientation of the line probe to smoothly extrapolate the shape of the inducing contour. (b) Observer settings were measured in terms of the polar angle θ and orientation φ of the line probe relative to the inducer tangent at the point of occlusion.