Size Constancy and Depth Perception

Size Constancy

Perception of an object's size remains constant despite distance changes.

Factors influencing Size Constancy

Occlusion, relative size, relative height, and depth cues affect perception.

Size-Distance Scaling Equation

Equation: S = R x d. S: Constant size, R: Retinal image size, d: Perceived distance.

Perception based on Distance

Objects seem smaller far away and larger up close on the retina.

Müller-Lyer Illusion

Lines appear different lengths due to corner perception.

Dumbbell Version of Müller-Lyer Illusion

Illusion persists without depth cues.

Alternate Versions of Illusions

Illusions remain even with depth cues removed.

Ponzo Illusion

Objects of the same size on the retina perceived differently due to depth cues.

Ames Room

Room where depth cues are manipulated to distort perception of people's sizes.

Conclusion on Size Perception

Depth cues can mislead perception of size.