01:830:310 Lecture Notes - Lecture 13: Sensory Neuron, Sensory System, Nociceptor
30 Jul 2016
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Document Summary
Most of your knowledge comes from senses. Information comes through light waves, air pressure changes, chemicals in air or liquid, and mechanical forces acting on the body. What you perceive is compiled by your perceptual system. General organization of sensory systems: sensory receptors, neural relays, central representations in the neocortex. Sensory receptors: receptors only respond to a range of stimuli. Sensory receptors respond to narrow band of energy. Vision: light energy chemical energy in photoreceptors aps (action potentials) Audition: air pressure mechanical energy auditory receptors aps. Taste and olfaction: chemicals fit into receptors aps. Pain: tissue damage release of chemical acting on pain fibers aps. Sensory receptors characteristics: receptive fields locate sensory events, receptors allow identification of change and constancy. Rapidly/slowly adapting receptors: receptors allow distinction between self and other. Exteroceptive - perceive body"s position, motion, and state. Interoceptive - perceive sensations in internal organs: receptor density determines sensitivity.
