PSYC 212 Lecture 4: 3.Elements-of-neurophysiology(lect.4)

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The ns can be divided into: (1) the cns (brain and spinal cord) and (2) pns (all nerves we have in our body) In general, (only exception is vision) our perceptions arise from the interactions between our pns and the environment. The physical stimulus interacts with a specific receptor located on a peripheral sensory neuron and causes the neuron to fire. The stimulus is transduced into an electrical signal. A doctrine formulated by johannes m ller (1801 1858) stating that the nature of a sensation depends on which sensory fibers are stimulated, not on how the fibers are stimulated. Example of transduction using pain and t actile perception: (example on temperature perception) Transduction occurs in 2 steps: (1) activation of transducers (protein receptors) on the membrane of the peripheral sensory neuron. Image: we have the membrane of a temperature receptor (sensory nerve) located in our skin and at the surface of this receptor we have complex proteins (called.

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