In the Ponzo Illusion, Two Horizontal Lines of Equal Length

question 61

Multiple Choice

In the Ponzo illusion, two horizontal lines of equal length are superimposed on radiating lines. Due to the presence of the radiating lines, the top horizontal line looks longer than the bottom one. What happens when hypnotized people are told not to see the radiating lines?

• A) The top line continues to look longer.
• B) The bottom line now looks longer than the top.
• C) They report that the two lines look equal in length.
• D) The horizontal lines disappear along with the radiating lines.

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