Psych Notes 9 27 11 Sensation and Perception Sensation how we take in sensory information from the environment o Temp difference pain smell Perception selection organization interpretation of sensory input o Making sense of the world around us Psychophysics Studies how sensation is turned into perception Threshold limits of human sensory input JND just noticeable difference o Ex Dead skin heavier Not aware of it o Ex Perceive light in dark room stronger than light room even though light is still there o How much of an increase must there be until it is just noticeable Weight must increase 1 30th to notice Light 1 60th Tones pitch 1 10th Pressure on skin 1 7th Loudness 1 10th Psychophysical scaling constant proportion of intensity of stimulus Visual System Cornea Pupil center of light governs amount of light getting to retina Retina thin layer of neuro tissue lines eye Light striking the retina initiates a cascade of chemical and electrical events that ultimately trigger nerve impulses o Sensory apparatus transduces electro magnetic energy o The lateral geniculate nucleus LGN primary relay center for visual information received from the retina of the eye found inside the thalamus of the brain o Rods specialized low light black and white o Cones specialized bright light color To see object in dark look to side of where you think object might be so it hits the rods on the outside of retina
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