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Can two dimensional depth cues and framing effects affect your perception of the size of an object, and if so, how much of an affect can such cues exert? By using the visual illusion known as "Ponzo," this experiment will attempt to answer these two questions. In order to help answer the second question (i.e., "how much an affect can such cues exert?"), this experiment will employ a psychophysical method known as limits.
The computer will present two horizontal lines between two tilted lines similar to the display in the interactive ponzo demonstration on the previous page. By judging whether or not the comparison line matches the standard, this experiment will measure of the effect of the Ponzo illusion on your perception of the relative sizes (i.e., lengths) of two objects.