Ch 5 BB

Ch 5 BB - 1 Sensation Chapter 5 2 Sensation Sensing the...

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Unformatted text preview: 1 Sensation Chapter 5 2 Sensation Sensing the World: Some Basic Principles Threshold Sensory Adaptation 3 Sensation Vision The Stimulus Input: Light Energy The Eye Visual Information Processing Color Vision Hearing The Stimulus Input: Sound Waves The Ear Hearing Loss and Deaf Culture 4 Sensation Other Important Senses Touch Taste Smell Body Position and Movement 5 Sensation & Perception How do we construct our representations of the external world? To represent the world, we must detect physical energy (a stimulus) from the environment and convert it into neural signals. This is a process called sensation . When we select, organize, and interpret our sensations, the process is called perception . 6 Bottom-up Processing Analysis of the stimulus begins with the sense receptors and works up to the level of the brain and mind. Letter A is really a black blotch broken down into features by the brain that we perceive as an A. 7 Top-Down Processing Information processing guided by higher-level mental processes as we construct perceptions, drawing on our experience and expectations. T H E C H T 8 Our sensory and perceptual processes work together to help us sort out complex images. Making Sense of Complexity 9 Sensing the World Senses are adapted to suit the needs of individual species. A frog has eyes with receptor cells that fire only in response to small, dark, moving objects. A frog could starve to death in a sea of motionless flies. We humans are sensitive to sound frequencies that represent the range of human voice consonants and a babys cry. 10 Exploring the Senses 1. What stimuli cross our threshold for conscious awareness? 1. Could we be influenced by stimuli too weak (subliminal) to be perceived? 1. Why are we unaware of unchanging stimuli, like a band-aid on our skin? 11 Psychophysics A study of the relationship between physical characteristics of stimuli and our psychological experience with them. Physical World Psychological World Light Brightness Sound Volume Pressure Weight Sugar Sweet 12 No Detection Intensity Absolute Threshold Detected Yes Yes No No Observers Response Tell when you (the observer) detect the light. 13 Absolute Threshold Absolute Threshold: Minimum stimulation needed to detect a particular stimulus 50% of the time. Proportion of Yes Responses 0.00 0.50 1.00 0 5 10 15 20 25 Stimulus Intensity (lumens) 14...
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Ch 5 BB - 1 Sensation Chapter 5 2 Sensation Sensing the...

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