Educational psychology . FlG. 21A. Fig. 21B. pears, for example with visual sensation, that theintensity of the stimulus prolongs the periods ofvisibility, which alternate with the periods of invisi-bility. Similar fluctuations may be studied in thediagrams of Fig. 21, though we might call themfluctuations as between different interpretations of thefigures. The subject fixates the middle line of thebook-cover a, and records, by pressing a key connectedwith a kymograph, the changes as the middle line

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