James Fraser は、どういう研究者だったのか。
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Thanks. Twitter will use this to make your timeline better. UndoUndo
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This might be the most powerful optical illusion I've ever seen. Even if I try to trace one of the circles with my finger my eyes start to get lost.
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This is not my original. It is an old, famous (to psychologists) illusion. Fraser, J. (1908) A new visual illusion of direction. British Journal of Psychology, 2, 307-320.
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