PSY 111 1st Edition Lecture 17 Review questions What is absolute threshold minimum intensity of a stimuli need for you to recognize it exist Difference threshold the smallest change in intensity of stimuli needed to recognize it as a change aka just noticeable difference or weber s law Where does the light enter the eye from pupil How doe pupil control how much light enters by contracting and expanding What happens when you are in darker light verses darker light dark means bigger pupils and bright light means smaller pupils Sensation and perception video Distal stimulus vs Proximal stimulus Proximal stimulus when it falls on the retina is inverted upside and is in 2D with holes and unclear bottom up processing Distal stimulus depth perception adding 3D filling the whole flipping the object top down processing done by the brain Lights enters the pupil and falls onto the lens which then flattens as it focuses objects that are at a distance or becomes more spherical as it focuses objects that are close Vision how we see color Rods and cones layer of light sensitive receptor cells located as the back of the retina Rods see light allow the eye to respond in dim light and help us see in the dim light Cones see color allow us to see fine detail but only work when light is adequate Blindness and the brain UCLA department of Neurology confirm that blindness causes structural changes in the brain Non visual areas in the brain were larger for blind individuals Especially for those blind since infancy Frontal lobe was unusually large Provided compensatory support Hearing relies on sound waves Sound waves slow down when traveling through a heavy medium eg water and speed up when traveling through a light medium eg air Audition the sensation and process of hearing For any sounds to reach our ears it must travel through a medium air water or any solid object that sound can move Deafness and the brain Deaf individuals use the hearing part of the brain to experience touch Touch and visions senses interact more in deaf individuals Balance and Movement Kinesthetic sense info provided about the position of the body and how the parts of the body in relations to each other Uses muscles and tendents Tells you about movement of the body and its parts even when stationary kinesthetic sense can provide info about its position Phantom limb pain common experience in limb amputees Thought to be caused by neural cortical reorganization Unused parts of the brains create pain sensation Brains is reacting to missing stimuli
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