A detailed study has been made of the bright phase patterns of Brown & Gebhard (1948) produced by looking at a uniform flickering field. The patterns have been classified on the basis of their geometrical properties. The subjects have been classified on a basis of the different types of pattern they report. The types of movement encountered and the effect of varying a number of parameters were investigated. The after‐images produced by this means were observed in a similar manner.
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John Smythies (1959) studied this question.
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