Illusory contours can be induced along directions approximately colinear to edges or approximately perpendicular to the ends of lines. Using a rating scale procedure we explored the relation between the two types of inducers by systematically varying the thickness of inducing elements to result in varying amounts of "edge-like" or "line-like" induction. Inducers for our illusory figures consist...

People’s placement of numbers on number lines sometimes shows linear and compressive scaling. We investigated whether people’s was affected by their range distribution, as indicated Parducci’s (Psychological Review, 72, 407–418, 1965) range-frequency theory. Experiment 1 found large effects when the endpoints were 1016. 2 showed compression 14 logarithmically distributed placed a line marked 1–...