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Sensation and perception two related fields of study in psychology Sensation is thepower to receive information from your surroundings through your senses Perceptual con-stancies is the ability to filter and organize all the information taken in by our senses Shapeconstancy gives us the ability to realize the shape of an object does not change when the angleof vision changes Size constancy is the realization that an objects size does not change reg-ardless of the distance from you Another type organizational stategy is figure-ground This isthe ability to distinguish the back-ground from the object of focus With these organizational stategies questions arise pertaining to the extent and origin of these abilities Is our ability toperceive figure-ground relationships present from birth or are they tought to us in our learn- Mr Turnbull an anthropologist answered these questions in the late 1950s and early 1960s While observing the BaMbuti Pygmies in the Ituri Forest in the Congo their natural setting he came across a young man named Kenge His entire life Kenge had lived in thethick jungle of the Congo He had never had a chance to use figure-ground strategies sizeconstancies or to judge distances Turnbull took Kenge to a clearing to see the Ruwenzori Mountains Having never seen a veiw from a great distance Kenge was speechless Hethought the mountains were rock formations Turbbull proceded to take Kenge to the moun-tains to get his reactions as to the size of them While leaving the mountain Kenge saw a herdof buffalo grazing in a feild a few miles away He thought the buffalo were insects The buf-falo being so far away were mistaken for beetles or ants Turnbull then took Kenge to thegrazing buffalo to show him the true size of the animals As they approached the herd Kengewas afraid He thought this was witchcraft or magic making the animals increase in size Once Kenge saw the actuall size of the animals he was
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