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Abstract: In attempt to describe human perceptual behavior, we suggest a rule ofrecognition which contains relations between physical variables (e. g.: lineextension) and perceived attributes. We used three different psychologicalmeasurements, namely identification, confidence and goodness scales. Theresults obtained have clearly demonstrated that each of the differentpsychophysical paradigms gives the same rule; this psychological rule can beexpressed with fuzzy sets and is a dynamic property when ambiguouslyshaped Chinese characters are presented in different directions. According to our findings, such a dynamic fuzzy relation is the reasonfor essential difference between a machine and a human observer for recognizinghand-written Chinese characters.

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