Chapter 6 - Chapter 6 Sensation and Perception 1 Sensation a The detection of physical energy emitted or reflected by physical objects The cells

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Chapter 6 Sensation and Perception 1. Sensation a. The detection of physical energy emitted or reflected by physical objects. The cells that do the detecting are located in the sense organs – the eyes, ears, tongue, nose, skin, and internal body tissue. 2. Perception a. The process by which the brain organizes and interprets the sensory information Our Sensational Senses 3. The Riddle of Separate Sensations a. Sense receptors i. Specialized cells that convert physical energy in the environment or the body to electrical energy that can be transmitted as nerve impulses to the brain. b. Doctrine of specific nerve energies i. The principle that different sensory modalities exist because signals received by the sense organs stimulate different nerve pathways leading to different areas of the brain. c. Synethesia i. A condition in which stimulation of one sense also evokes another. d. Functional codes i. Rely on the fact that sensory receptors and neurons fire, or are inhibited from firing, only in the presence of specific sorts of stimuli. 1. Which, how many, rate, patterning - forms a functional code Measuring the senses 4. Absolute thresholds a. The smallest quantity of physical energy that can be reliably detected by an observer b. Measure how sensitive the senses are 5. Difference thresholds a. The smallest difference in stimulation that can be reliably detected by an observer when two stimuli are compared; also called just noticeable difference (jnd) 6. Signal detection theory a. Theory that divides the detection of a sensory signal into- i. Sensory process: which depends on the intensity of the stimulus ii. Decision process: influenced by the observers response to bias 1. Hit 2. False alarm 3. Miss 4. Correct resonse
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7. Sensory adaptation a. The reduction or disappearance of sensory responsiveness when stimulation is unchanging or repetitious b. Ex. The watch on your wrist, no need to feel is most of the time c. Sensory deprivation: the absence of normal levels of sensory stimulation 8. Sensing without perceiving a. Selective Attention i. The focusing of attention on selected aspects of the environment and the blocking out of others b. inattentional blindness i. failure to consciously perceive something you are looking at because you are not attending to it
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This note was uploaded on 04/03/2008 for the course PSYCH 111 taught by Professor Schreier during the Fall '08 term at University of Michigan.

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Chapter 6 - Chapter 6 Sensation and Perception 1 Sensation a The detection of physical energy emitted or reflected by physical objects The cells

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