UT Arlington PSYC 3322 - ElectricalTransmission ch 4 (42 pages)

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ElectricalTransmission ch 4



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ElectricalTransmission ch 4

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Pages:
42
School:
University of Texas at Arlington
Course:
Psyc 3322 - Brain and Behavior

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How Do Neurons Use Electrical Signals to Transmit Information Early Clues That Linked Electricity and Neuronal Activity Galvani 18th Century Electrical Stimulation Electrical Stimulation Studies Fritsch and Hitzig Mid 19th Century Electrical stimulation of the neocortex causes movement arms and legs Bartholow 1874 First report of human brain stimulation Electricity and Electrical Stimulation Electricity A flow of electrons from a body that contains a higher charge to a body that contains a lower charge Negative Pole The source of electrons higher charge Positive Pole Location to which electrons flow lower charge Electricity and Electrical Stimulation Kolb Whishaw An Introduction to Brain and Behavior Third Edition Chapter 4 Early Clues That Linked Electricity and Neuronal Activity Caton Early 19th Century First to attempt to measure electrical currents of the brain using a voltmeter and electrodes on the skull Electroencephalogram Electrical brain graph that records electrical activity through the skull or from the brain and represents graded potentials of many neurons Early Clues That Linked Electricity and Neuronal Activity von Helmholtz 19th Century Flow of information in the nervous system is too slow to be a flow of electricity Nerve conduction 30 40 meters second Electricity 3 108 meters second It is not the charge but the wave that travels along an axon Bernstein 1886 Electricity and Electrical Stimulation Electrical potential Volt Electron Voltmeter Current Negative pole higher charge Positive pole lower charge Difference Electrical Potential volts Neurons can convey information as a wave induced by stimulation on the cell body traveling down the axon to its terminal A voltmeter detects the passage of the wave Tools for Measuring a Neuron s Electrical Activity Giant Axon of the Squid Much larger in diameter than human axons Humans 1 to 20 micrometers Squid Up to 1 millimeter 1000 micrometers Easier on which to perform experiments Used by Hodgkin and Huxley



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