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. Fig. 21C. Gabriel Maxs CiikistusThe eyes appear to open and close. ATTENTION, FEELING, AND WIL
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. Fig. 21C. Gabriel Maxs CiikistusThe eyes appear to open and close. ATTENTION, FEELING, AND WILL 229 seems now near, now far. The same procedure isfollowcnl for h and c. It will usually be found thatthe complex objects, the shaded blocks and the facegive fewer fluctuations than the sinijiler object, thebook-cover. Published results on this point may befound in a paper by Fliigel,^^* and in one by me.*^*^Whether these changes depend npon • peripheral or central factors does not concern us here, since,on either supposition, the fact of complexity of figureand the fact of stability of interpretation go we attend to more than one thiug at a time,and if so, how many ? Tests of the span of con-sciousness measure the number of impressions or ofsmall objects which can be correctly apprehended ata given instant of time. For visual and auditoryimpressions this number is about five to seven. Thenumber increases somewhat with age, but according tothe results of Whipple is not suscep
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