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Lecture 9

PSY2301 Lecture 9: PSY 2301 - Feb 09 - Action Potential

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Patrick Davidson

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How Do Neurons Use Electrical Signals to Transmit Information? Part 1: Searching for electrical activity in the nervous system Electrical activity of a membrane Early Clues that Linked Electricity and Neuronal Activity Electrical Stimulation Studies Fritsch and Hitzig (midnineteenth century) Electrical stimulation of the neocortex causes movement (arms and legs) Bartholow (1874) First report of human brain stimulation Von Helmholtz (nineteenth century) Flow of information in the nervous system is too slow to be a flow of electricity Nerve conduction: 3040 meterssecond Electricity: 3 x 108 meterssecond It is not the ions themselves that travel along the axon but rather a wave of charge (Bernstein, 1886) Resting Potential How the Movement of Ions Causes Electrical Charges Diffusion Movement of ions from an area of higher concentration to an area of lower concentration through random motion
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