everything you need to know about perception =)

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  • Created on: 21-06-11 14:06
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· Describe the difference between sensation and perception using shape constancy, colour
constancy and visual illusions
Sensation is collecting data from the environment via our senses and perception is interpreting that data
once it has been sensed. Visual illusions are the effect of misinterpreting the data. These are the
following types of illusions:
Geometrical illusions ­ when two identical lines or shapes appear to be different sizes due to
their surroundings
Ambiguous figures ­ images which can be interpreted in more than one way.
Fictions ­ this is seeing something which is not there but the outlines allow us to see the illusion.
Visual constancies allow us to see things as remaining the same even if their physical appearance tends
to change. There are two types of constancies:
Shape constancy ­ we are able to perceive the shape of an object even though it appears to
change through movement
Colour constancy ­ we able to perceive the colour of an object even though it appears to
change through lightings.
· Explain depth cues, including linear perspective, height in plane, relative size,
superimposition and texture gradient
Depth cues are cues which help us to create a third dimension in our brain. These are the following
depth cues:
Linear perspective ­ a road would be a good example of this. This is when two lines appear to
Height in plane ­ if an object is placed above the horizontal line then it looks as if it is far away
but if it is below the horizontal line then it looks as if it is closer.

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Relative size ­ the object which is above the horizontal line appears to look smaller than the
object which is below the horizontal line.
Superimposition ­ it is when one shape or an object is covering the other shape or object
Texture gradient ­ in a beach where there's sand, the sand near you would look rough and
you'd be able to see the texture but if you look further away then you'll see the sand blend in
and look really smooth.…read more

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They were given a clipboard and a questionnaire to fill in.
Results showed that most people relied on their past experiences to estimate the objects. The mostly got
the real life objects right rather than the cutouts. This supports the constructivist theory.
· Outline limitations of Haber and Levin's study
Some people may be good at guessing than others.
Only male participants were used in the experiment gender biased. The results cannot be generalized
for various reasons. A small sample was used.…read more


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