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| Question | Answer |
| Visual illusion | A conflict between reality and what we perceive. |
| Fiction | An illusion caused when a figure is perceived even though it is not present in the stimulus. |
| Illusory contour | A boundary (edge) that is perceived in a figure but is not present in the stimulus. |
| Motion after-effect | An illusion caused by paying attention to movement in one direction and perceiving movement in the opposite direction immediately afterwards. |
| Colour after-effect | An illusion caused by focusing on a coloured stimulus and perceiving opposite colours immediately afterwards. |
| Ambiguous figure | A stimulus with two possible interpretations, in which it is possible to perceive only one of the alternatives at any time. |
| Distortion illusion | Where our perception is deceived by some aspect of the stimulus. This can affect the shape or size of an object. |
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