–Primary•Convergence(eye muscles pull eyes inwards to focus on near objects)•Retinal disparity(process of stereopsis i.e. Our brain merges 2 images into1)•Accommodation(lens changes shape depending on how far or near objectis)
It is likely we are born with ability to use primarycues but..... new born infants can’t co-ordinate their eyes very well – until about3-12 months, it is probably not till about 6-12 months that retinal disparity is more accurate. So does thevisual cliff experiment really test innate ability or learnt?
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Testing ability to use secondary cues
Granrud & Yonus 1984. Do young infants use ‘overlap’ to decideif one object is in front of another?
If one object appears to partially cover another,we assume the first object is in front.
•This was investigated by Granrud and Yonus 1984.
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Babies tend to reach for objects that are nearer
•Shapes A suggest depth because of overlap.–7 month old babies reached for the left shape–5 month old babies didn’t.•Shapes B and C don’t contain depth cues.–Neither age group reached for the left shape•Suggest babies are influenced by depth cues butthe ability to perceive the overlap cue may notappear until 7 months of age.
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