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Visual sensation differs from visual perception even though the two processes form a sequence Our brain obtains meaning from what we look at through the process of sensation and perception Grivas Down Carter pg 77 Though the two systems interact they both serve a different purpose Sensation is a physiological process which involves the reception and transduction of information and its transmission to the brain Grivas Down Carter pg 77 In other words sensation involves collecting the sensory data converting it to electromagnetic energy and sending this information to the brain After the sensation process comes perception Perception is a mental process of organising sensations into meaningful patternsCoon glossary pg 15 Visual perception is influenced by emotional states motivation and many other psychological factors So visual sensation is the organisation of the information our sensory receptors receive and visual perception is the organising and interpreting of the sensations This shows the distinctions between visual sensation and visual perception The above demonstrates that the sensory system receives the same data via the sensation process but each individuals perception system interprets it differently An example of this might be when my mother and I go shopping together She usually wants me to buy things that she likes but I generally think they look disgusting Even though we are both looking at the same thing we both have different perceptions of what is fashionable There are several visual perception principles which play part in the way we perceive things One of these is size constancy Size constancy is something we must learn through our life experience Size constancy occurs when The perceived size of an object remains the same even though the size of the image it casts on the retina changes Coon pg 120 An example of size constancy might be when flying in a plane When I look out the window and view the world below
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