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Ch10 Textbook Notes

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Christine Burton

CHAPTER 10 PERCEIVING DEPTH AND SIZE Cue approach to depth perception focuses on identifying information in the retinal image o Eg occlusion a cue that one object is in front of another o We learn the connection between cues and depth through previous experienceOculomotor CuesCues based on our ability to sense the position of our eyes and the tension in our eye muscles created by o Convergence the inward movement of the eyes that occurs when we look at nearby objects o Accommodation the change in the shape of the lens that occurs when we focus on objects at various distancesUseful up to a distance of about arms length with convergence being more effectiveMonocular CuesWork with only one eye and includes accommodation pictorial cues and movementbased cuesRange of effectiveness of different depth cues o All occlusion relative size o 02 metres accommodation convergence motion parallax o 220 metres motion parallax relative height o 30 metres relative height atmospheric perspectivePictorial CuesSources of depth information that can be depicted in a picture OcclusionOccurs when one object hides or partially hides another from view o Only indicates relative distance not absolute distance Relative HeightObjects that are below above the horizon and have their bases higher lower in the field of view are usually seen as being more distantConnection between observers gaze and distance o Eg looking straight out high in visual fieldgreater depth Relative SizeWhen two objects are of equal size the one that is farther away will take up less of your field of view than the one that is closer Perspective ConvergenceThe perceptual comingtogether of parallel lines Familiar SizeUsed when we judge distance based on our prior knowledge of the sizes of objectsEpstein 1965 Observers judged the of a picture of a dime as the closest a quarter as farther and a dollar as the furthest o Judgement only occurred when pictures were viewed with one eye
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