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1. One of items below is not part of the human eye.  Which one? 
 a) 1. One of items below is not part of the human eye.  Which one? 
 a) optic chiasm  
 b) cornea 
 c)  retina 
 d) lens   

2. Which aspect of vision are cones responsible for? 
 a) color 
 b) black and white 
 c) focus 
 d) depth perception 

3.  When the background effects how a figure is perceived, this is called _____ . 
 a) figure ground perception 
 b) size constancy 
 c) depth perception 
 d) binocular disparity 

4. The non-background stimuli is called _____ . 
 a) the aim 
 b) the target 
 c) the objective 
 d) the fovia 

5. The Law of Pragnanz is also known as ____ . 
 a) the Law of Duplicity 
 b) the Phi Phenomenon 
 c) the Law of Simplicity 
 d) the Law of Binocular Disparity 

6. Which of the following is not a form of the Law of Pragnanz? 
 a) grouping 
 b) connection 
 c) closure 
 d) following 
 e) b and d 

7. Your brain interpreting the tension in the muscles that control eye movement in order to judge depth is _______ . 
 a) convergence 
 b) binocular disparity 
 c) depth identification 
 d) three dimensional judgement 

8.  The depth cue that is based on the difference between two images is _____ . 
 a) convergence 
 b) binocular disparity 
 c) depth identification 
 d) three dimensional judgement 

9. Magic Eye can also be referred to as _____ . 
 a) really cool 
 b) a stereogram  
 c) a three dimensional image 
 d) a fad 

10.  When you see an airplane in the sky you know there are many people on board, despite its fingernail size.  This is due to _____ . 
 a) really small people 
 b) size constancy  
 c) binocular disparity 
 d) convergence 

11.  Explain the moon illusion.  See Size Constancy

12.  Size constancy occurs due to ____ . 
 a) memory stores  
 b) retinal image constancy 
 c) confusion 
 d) depth perception 

13.  We perceive same size circles as being different sizes because of _____ . 
 a) the relationship to the surrounding circles  
 b) they actually are different sizes 
 c) our left eye judges size better than our right eye and thus the circle on the right seems larger 
 d) humans are very bad at judging size 

14.  The iris:  
 a) is the colored part of the eye 
 b) controls the amount of light that enters the eye 
 c) is the black dot at the center of the eye 
 d) both a) and b)  

15.  We perceive the sides of the square centered over top of several closely spaced concentric circles as being bent inward because of _____ . 
 a) size constancy 
 b) depth perception 
 c) background mediated illusion  
 d) the fact that they actually are bent inward 

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