When You Stop at a Railroad Crossing at Night, Instead

question 134

Multiple Choice

When you stop at a railroad crossing at night, instead of correctly perceiving two red lights that flash alternately you may perceive a single red light that moves back and forth from left to right. This is an example of ________.

• A) stroboscopic motion
• B) the autokinetic illusion
• C) the phi phenomenon
• D) the Muller-Lyer illusion

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