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Unformatted text preview: 1 1 General Psychology 47.101 Sensation and Perception 2 3 4 The man who mistook his wife for a hat Dr. P was an accomplished musician and teacher , had a serious neurological disorder. It started out looking like Alzheimer's as he became unable to recognize the faces of his students. As the disease progressed, he sometimes mistook fire hydrants and parking meters for people and stopped to talk with them. When Dr. Sacks examined Dr. P for the first time, he found his reflexes slightly abnormal on the left side. After scratching the sole of his left foot to test his reflexes, he instructed Dr. P to put his shoe back on. He couldn't do it, because he could recognize neither his foot nor his shoe. When the examination was over, Dr. P reached over to put his hat on, but instead of a hat, he tried to lift off his wife's head. Dr. Sacks took a rose out of his lapel and asked Dr. P to identify it. He could not name it, but he was able to describe it's dimensions, shape and color. However, when he smelled it, he immediately knew it was a rose. From this, Dr. Sacks determined that the problem was in his parietal and occipital lobes where visual processing occurs. 5 Roadmap Defining sensation and perception Process of sensation Laws of psychophysics Sensory systems in more detail Vision; Hearing; Smell; Taste; Touch Organizational Processes in Perception Grouping Perception Constancy Depth Perception Motion perception Influences on Perception Attention Prior knowledge 6 Sensation stimulation of sense organs Raw material Perception selection, organization, and interpretation of sensory input to produce meaning Polished output Some definitions. 2 7 From sensation to perception. From sensation to perception. Identification/Recognition Identification/Recognition Perceptual Organization Perceptual Organization Sensation Sensation Environmental stimulation Environmental stimulation Top-down processes (conceptualy driven) Bottom-upProcessing (data-driven) Retinal image (only sensory fragments and angles and lines) Sensory processes - Transduction Bottom up Processes 8 But there is a twist Bottom-up: Progression from individual elements to the whole (e.g., sensory input recognition Top-down: Perceptual representation is affected by progression from the whole to the elements Guided by our expectations, past experiences, motivations and other aspects if higher mental functioning Sensation is generally a bottom-up process Perception is an interaction between bottom-up and top- down processes 9 10 11 Stages of Sensation, Perception, Organization and Recognition Stages of Sensation, Perception, Organization and Recognition Mental Processes Mental Processes Identification/Recognition Identification/Recognition Perceptual Organization Perceptual Organization Sensation Sensation Environmental stimulation Environmental stimulation Top-down processes (conceptualy driven) Bottom-upProcessing (data-driven)...
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- Fall '10