PSYC 1013 Lecture Notes - Lecture 3: Neural Coding, Basal Ganglia, Snake Venom
4 Mar 2018
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Images of blood flow: activity in response to various tasks. Judged to be 100% accurate, more accurate than a polygraph test. Soma: cell, body, dendrites, receives signals to adjacent neuron, axon, transmits signals to adjacent neurons, synapse, space between neurons that doesn"t touch. Many axons are covered with tube-like: myelin sheath, fatty, whitish insulation, glial cells, nodes of ranvier, intervals where the myelin sheath is thin or absent, allows electrical conduction to skip from node-node 300km/h. Brain: grey matter unmyelinated, white matter myelinated, multiple sclerosis, loss of myelination of neural pathways, influences impaired sensations and movement, axon breaks down, brain thinks myelinated sheath is a foreign subject and destroys it. Neural impulse: hodgkin and huxley (1950, giant squid studies, fluids inside and outside the neuron, electrically charged particles (ions, neurons is not being stimulated, at rest negative charge inside compared to outside.
