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In the early 20th Century , Wilhelm Wundt identified contrast as a fundamental principle of perception , and since then the effect has been confirmed in many different areas .
 person: Wilhelm Wundt
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Wilhelm Wundt 
Answer:
 person: Wilhelm Wundt