As said before, gestalt
principles allow you to be vulnerable to illusion. Top-down processing
is involved in your brain falling for these illusions.
Two important points to note about optical illusions are:
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👁 Monocular Cues
To recall, the main monocular cues are:
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If two images are, in reality, the same size, we would perceive the one closest to us to be larger. For example, if you place one teddy bear close to the camera and another really far away from the camera, the one closer would look larger. This happens even though the two teddy bears are really the same size.
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Image Courtesy of @Psych_Review.
Image Courtesy of Jim Foley
👀 Binocular Cues
The main binocular cue to know is retinal disparity, the difference between the two images your eyes see. Your brain judges distance by comparing the images from both eyes.
Practice AP Question
The following question is from the 2011 AP Psychology Exam
. It's great review for both this unit and unit 1!
A researcher designs a study to investigate the effect of feedback on perception of incomplete visual figures. Each participant stares at the center of a screen while the researcher briefly projects incomplete geometric figures one at a time at random positions on the screen. The participant’s task is to identify each incomplete figure. One group of participants receives feedback on the accuracy of their responses. A second group does not. The researcher compares the mean number of figures correctly identified by the two groups.
A. Identify the independent and dependent variables in the study.
B. Identify the role of each of the following psychological terms in the context of the research
C. Describe how each of the following terms relates to the conclusions that can be drawn based on the research.
for this Question