A supernormal period in central axons following single cell stimulation.
Intracellular recordings were obtained from caudate (Cd) nucleus efferent neurons in the cat. A supernormal period, as characterized by increased excitability and conduction velocity, was found for the Cd efferent fibers following either a conditioning antidromic action potential, or a single orthodromic action potential induced by direct current application through the recording microelectrode. These data indicate that the impulse activity of a single fiber can modulate excitability and conduction velocity independent of surround impulse activity.
D000818:Animals; D001369:Axons / Q000502:physiology*; D002415:Cats; D002421:Caudate Nucleus / Q000502:physiology*; D004558:Electric Stimulation; D005071:Evoked Potentials; D005917:Globus Pallidus / Q000502:physiology; D008297:Male; D009431:Neural Conduction; D009433:Neural Inhibition; D009434:Neural Pathways / Q000502:physiology; D009474:Neurons / Q000502:physiology; D012032:Refractory Period, Electrophysiological; D013378:Substantia Nigra / Q000502:physiology