Fig. 2. Examples of two psychometric curves of one subject in an active, samefinger condition. The response is plotted against the curvature of the test stimulus. The psychometric curves were obtained by fitting cumulative Gaussians to the data. The circular data points represent the response when adaptation was performed with the convex adaptation stimulus; the square data points result from adaptation with the concave adaptation stimulus. The points of subjective equalities are given by PV and PC, respectively. The magnitude of the aftereffect (AE) is defined as the difference between PV and PC.
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