Electrophysiology of the Retina: Response to Stimulation and the Transduction Process

  • Hugh Davson
Chapter

Abstract

When a receptor is stimulated, a succession of electrical changes takes place in its conducting nerve fibre. These changes are measured by placing electrodes on the nerve fibre and connecting them to a device for recording rapidly occurring potential differences, an oscillograph. A series of electrical variations, called action potentials or ‘spikes’, is obtained when the receptor is stimulated. The duration of an individual spike is very short (it is measured in milliseconds) and, as the strength of the stimulus is increased, the frequency of the discharge (the number of spikes per second) increases, but the size of the individual spikes remains unaltered (‘all-or-none’ effect).

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Copyright information

© Hugh Davson 1990

Authors and Affiliations

  • Hugh Davson
    • 1
    • 2
    • 3
  1. 1.St. Thomas’s HospitalSouthampton University Medical SchoolsLondonUK
  2. 2.King’s CollegeLondonUK
  3. 3.University CollegeLondonUK

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