Nervous System - Basic Sensory

Sensory units and sensory pathways labeled line theory

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Unformatted text preview: articular modality (energy form of stimulus) Receptor Potentials and Adaptation Stimulus causes a changed membrane potential of sensory receptor Graded potential, caused by opening and closing ion channels Can generate an action potential only if greater than threshold Decreased amplitude of receptor potential over time with constant stimulus Corresponding decrease in frequency of action potentials Decreased perception of stimulus over time The stimulus is constant over time, but the receptor’s ability to recognize the stimulus decreases. Sensory Units and Sensory Pathways Labeled line theory: specific neural pathway for each sense Sensory Unit: single afferent neuron...
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