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09 Notes - Chapter5Sensation...

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Chapter 5- Sensation Sensing the World: Some Basic Principles - Threshold - Sensory Adaption Vision - The Stimulus Input: Light Energy - The Eye Sensation & Perception How do we construct our representations of the external world? Sensation : we detect physical energy (a stimulus) from the environment and convert it into neural symbols Perception : Bottom-up Processing Analysis of the stimulus begins with the sense receptors and works up to the level of the brain and mind Top-Down Procession Info processing in guided by higher-level mental processes as we construct perceptions, drawing on our experience and expectations. Making Sense of Complexity Our sensory and perceptual processes work together to help us sort out complex images (“The Forest Has Eyes” Bev Doolittle) Sensing the World Senses are nature’s gift that suit an organism’s needs. - A frog feeds on flying insects (bug detector neurons); a male silkworm moth is sensitive to female sex-attractant odor; and we as human beings are sensitive to sound frequencies that represent the range of human voice.
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