What is the difference between sensation and perception?

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					What is the difference between
 sensation and perception?
 •Sensation is gathering
      info from the
  environment via your
         senses.
     •Perception is
  understanding what is
     being sensed!
What do we call it when there is a
mismatch between sensation and
perception – when we misinterpret
             the info?
  What are geometric illusions?
• Our perception of size is
  distorted.
• E.g. the top yellow line appears
  longer than the bottom yellow
  line.
 What are Ambiguous figures?
• When an object
  can be seen in
  more than one
  way. Do you
  see a man
  playing the
  saxophone or a
  womans face?
          What are fictions?
• When you see
  something that is not
  there. E.g. the white
  triangle
    What is shape constancy?
• The ability to perceive
  the shape of an object
  even if it’s seen from
  different angles
                                        Rectangle Still a
                            Rectangle
                                                  flipping
                                                  rectangle!!!!
    What is colour constancy?




             Red lighting   Green lighting


• We can still tell what colours are in different
  lighting, e.g. you can see the blue squares even
  when under red or green lighting.
    What is depth perception?
• The ability to perceive the world in 3D.
   What are the 5 depth cues that
  your brain uses to perceive in 3D?
Linear perspective
                            Superimposition
Height in the
plane

                              overlapping


                     Texture gradient
Relative size
What do you need to say if the
exam question asks you about
CONSTRUCTIVIST THEORY
    How do your expectations
influence your perception here?
      Limitations with constructivist
                  theory
INDIVIDUAL EXPERIENCES – rarely
do we disagree with people about
what we see but we all have different
past experiences.

Newborn babies – no past experience but
can still perceive, e.g. imaginary cliff



Learning – if past experience causes
perception then after learning how an
illusion works it should cease to fool us but
this is not the case!
        The Nativist theory
• Bottom up processing
• Immediate or direct – no past
  experience needed
              See it first then the
              brain registers it.
What are these?
Haber & Levin (2001)
   Haben & Levin’s conclusion
• They could tell the distance and size of the
  real world fixed size objects because they
  relied on their PAST EXPERIENCE of
  these objects.
• The other objects could vary in size so
  they couldn’t rely on their past experiences
  in the same way.
• Supports CONSTRUCTIVIST theory.
The limitations!!!!!




                •9 sample size too small
                •Male gender bias
                •Students not
                representative
     Other forms of subliminal
       messaging include:

1/3000th second image, sales of
 coca cola increase at cinema

 When Italian music was played
over tanoy in supermarkets, sales
    of Italian wine increased.

				
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posted:8/31/2012
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