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Depth Cues_ Evidence supporting Constructivist - Mind Map
- Depth Cues: Evidence supporting Constructivism Perception (Gregory, 1972)
- This is critical as the perceptual system needs to transform 2D retinal images into a 3D interpretation of the real world.
- Monocular Cues - They give the perceptual system the impression of 3D. They are seen by one or two eyes.
- Monocular cues are used by artists to create the perception of depth in painting and drawings.
- Linear Perspective
- Where converging lines look like they will meet at some point although top - down knowledge tells us that the pillars remain parallel.
- Aerial Perspective
- Light is scattered as it travels through the atmosphere. This makes objects in the distance look hazy.
- Overlapping objects give a sense of depth. It is when a nearer objects hides a more distant one.
- Shading provides good evidence of the presence of 3D as 2D do not cast shadows.
- The perceptual system makes assumptions about the structure of the image based on where the light source typically is.
- Example - Bump or Dip?
- Relative/Familiar Size
- This helps us make a judgement on how far away something is
- This is achieved by comparing the size of the image on the retina with long-term knowledge of how big objects are.
- Ittleson (1951) used three sizes of playing cards: normal sized, half sized and double the size.
- P's had to judge the distance of the card. Distance judgements were based on familiar size.
- The normal size card was judged to be 2.28 meters away whereas the half sized card was judged the be twice as far and the double sized was half as far away.
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