Otto Heller with his stimulus series of apples
150 x 100 x 2.5 cm (h x w x d)

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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Heinz Alfred Müller (1930-1990)
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Arnold on the balance between theory and practice, 1956
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100 x 150 x 2.5 cm (h x w x d)
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