Which TWO of the following statements are true of simultaneous contrast illusions? 1. In the simultaneous tilt illusion, vertical stripes appear tilted away from the tilt of their surrounding stripes. 2. In the luminance illusion, a grey patch appears darker when surrounded by a dark area than when surrounded by a light area. 3 A purple patch appears slightly closer to blue when surrounded by red, and closer to red when seen against a blue background. 4. Visual illusion effect only exist for motion.
Correct answer: A. 1 & 3
- A. 1 & 3
- B. 2 & 3
- C. 3 & 4
- D. 2 & 4
Explanation
In the tilt illusion, surrounding orientation can make a vertical pattern appear tilted away from the surround, and colour contrast shifts purple toward blue against red and toward red against blue. Statement 2 reverses the luminance effect because grey appears lighter against dark and darker against light, while statement 4 is plainly false.
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