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The peripheral factor in the Bakes experiment is inferred from control experiment* introduced by Knot* (4) in research with visual stimuli as signal for response. * Research is now under way to determine whether or not systematic variations in these three areas do occur, or whether the variations noted are to be described as 'chance.' * The authors wish to acknowledge the assistance of Mr. P. E. Griffith in the design and construction of this instrument.

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