Illusions ● Incorrect perceptions ● Error in hypotheses in stimulus ○ Most are related to constancies ○ Used for us to see object more clearly ● Distance que of our vision makes error ● ex) ○ Size consistency brakes down ■ Error occurs in hypothesizing distance/size of an object ■ Dept could not be hypothesized Ponzo illusion ● Ponzo illusion ○ Judgment of size-size casted by two people ○ Perceptual hypothesis is influenced by context ■ On which stimulus occurs ○ Ponzo ladder ■ Contex can make illusory perceptions In class activity ● Of all 34 students, only 5 has answered they seemed to be in same length ○ Majority of class answered they were in different length were bottom line seems to be in shorter length Response Number of Students Interpretation Different 29 Thought lines were unequal Same 5 Thought lines were equal ● Most students were affected with Ponzo illusion ○ trick depth perception ● line on top noticed to be in distance ● line in bottom seems to be in closer range ○ even if they are the same length, since they are recognized differently(distance) therefore the length of the line in the distance seems to be in greater length. ● Top-down processing ○ brain applying past knowledge of image ○ here, Dept= Size