Otto Heller with his stimulus series of apples
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Otto Heller was intensively involved in frame of reference research and investigated it with various stimulus series. These included weights, cigarette of different length and also apples of different size.

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New University opened in 1896
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Oswald Külpe's certificate of appointment 1894
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Domstraße Würzburg
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Oswald Külpe (1862-1915)
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Letter Volkelt - Wundt January, 1 1894
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