09-17-10 - CODING OF SENSORY INFORMATION S nsory syste s e...

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CODING OF SENSORY INFORMATION
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Sensory systems • Sensory systems tell you what and where things are in the environment. • More or less emphasis on where. • Many reflexes are designed to recruit additional senses. • Main senses for humans
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1 2 3 The senses share 3 common steps in information processing: 1) a physical stimulus (environmental energy) 2) transduction (transformation from physical to neural energy) 3) behavioral response (action or perception)
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Sensory systems convey basic 4 types of information: 1) modality – type of physical energy (touch, light, sound, chemical) 2) location 3) intensity 4) timing v
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Sensory systems convey 4 types of information: 1) modality – type of physical energy (touch, light, sound, chemical) 2) location 3) intensity 4) timing Example: Sense of touch A variety of nerve types that are sensitive to mechanical pressure on the skin
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Record from nerve fibers (Microneurography)
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Two broad categories: “rapidly adapting ” and “slowly adapting ” receptor types. Initial contact activates both Steady pressure is mainly signaled by slowly adapting receptors, while vibration is mainly signaled by rapidly adapting receptors. Modality is Touch (mechanical stimulation), But, note that there are sub-modalities involving different types of touch nerves (eg steady pressure vs vibration) Also true of other modalities (not just touch)
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A stimulus must be within a receptor’s “receptive field to generate a response. Note that different receptor types have different receptive fields. Location is indicated by populations of receptors
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A “topographic” representation of sensory space is maintained throughout the nervous system. * This is an important organizational
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This note was uploaded on 09/19/2010 for the course BIOS 286 taught by Professor Murphy during the Fall '06 term at Ill. Chicago.

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09-17-10 - CODING OF SENSORY INFORMATION S nsory syste s e...

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