Perception, Sensation

1751 WordsApr 7, 20138 Pages
“Perception is more than just a sensation” Introduction Sensation is the passive process of bringing information from the outside world into the body and brain. Perception is the active process of selecting, organising and interpreting the information brought to the brain by the senses. Sensation and perception are two distinct processes, which collaborate to help us make sense of our environment. Perception requires physiological mechanisms and psychological components, these combine to help us understand. Perception is the process of how we acquire and understand information, sophisticated perceptual mechanisms go to work in order for us to gain knowledge. Our perception of the world is “direct, immediate and effortless” (Mather,…show more content…
Similar to a colour wheel explanation of vision taking just three colours and blending them to make any colour. Seventy years before we knew that humans have three retina cones- red, green and blue. Opponent-process theory Herring (1870) suggested cone photoreceptors are linked together to form three opposing colour pairs, red/green, blue/yellow, light/dark. The two stage theory was output of three cone types recoded by another layer of neutral mechanisms into 6 psychologically primary colours. (Hurvich & Jameson, 1957) Perceptual constancies Size constancy means objects maintain the same size, despite changes in proximal stimulus, people that are further away do not seem smaller than people that are close. This is exhibited in the Ponzo illusion. The Ponzo illusion. In the Ponzo illusion, two identically-sized lines appear to be different sizes when placed over parallel lines that seem to converge as they recede into the distance. How Does the Ponzo Illusion Work? The Ponzo illusion was first demonstrated in 1913 by an Italian psychologist named Mario Ponzo. The reason the top horizontal line looks longer is because we interpret the scene using linear perspective. Since the vertical parallel lines seem to grow closer as they move further away, we interpret the top line as being further off in the distance. An object in the
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