All these illusions challenge what we percieve.
case-scenario-relevance absorb concluded visual appetite bio-spectrum briefly indicated absence variety and scope,truce,logos
If the railway were removed from the background, nobody would perceive these two horizontal lines as one longer than the other. So, we are still tricked by the secondary monocular depth cues.
Psychology - Ponzo
This illusion, also known as the railway illusion, appears to result from
the same visual perceptual principles at work in the Muller-Lyer and moon
The upper and lower horizontal lines are the same length but the upper one
appears longer. This illusion probably occurs because the converging lines
on either side convey linear perspective  and provide a sense of
distance, suggesting that the upper line is further away. Just as in the
Muller-Lyer illusion, we think that if two lines cast equally long retinal
images, but one seems further away, the more distant one is assumed to be
longer. Thus, the Ponzo illusion  is due largely to a combination of the
misapplication of size constancy  and the misperception of depth.
Previous | Next
Log in to save your progress and obtain a certificate in Alison’s free Psychology: Memory and Cognition online course
Sign up to save your progress and obtain a certificate in Alison’s free Psychology: Memory and Cognition online course
Please enter you email address and we will mail you a link to reset your password.