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205textnotes14 - adaptation receptors responsiveness to a...

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3) coding of intensity: (graded potentials) Fig. 10-7 - strength (weak to strong) - coded by the frequency of action potentials - strong stimulus => big receptor potential => increased number of action potentials (increased frequency of action potentials) - sensory receptors are capable of a huge range in interpreting stimulus strength. - saturates at super-maximal stimuli (non-linear). - hyperpolarizing or depolarizing - receptor membrane is structured to have ion channels responsive to specific stimuli - there is an area of membrane some distance from the receptor endings(s) where action potentials are generated - the greater the stimulus intensity the greater the frequency of action potential generation. 4) stimulus duration: (Fig. 10-7,10-8) - duration of action potential frequency in response to a constantly applied stimulus
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Unformatted text preview: - adaptation receptors responsiveness to a stimulus declines with time " rapidly (phasic) adapting receptors " - a relatively short burst of action potentials in response to the initial stimulus " slowly (tonic) adapting receptors " -the rate of the action potentials decreases slowly -----------------------------------------------------------SENSORY PHYSIOLOGY: B. Somatic Sensation and Pain----------------------------------------------------------- B.1. Introduction : Somatic sensations are the sensations of the body surface, the deep tissues, and the viscera. There are 4 modalities of somatic sensations: 1. Touch, 2. Proprioception, that is sense of limb position and limb movement, 3. Pain, 4. Thermal sensation....
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