Accession Number:

AD0646966

Title:

NEUROELECTRIC ACTIVITY DISPLAYED BY COMPUTER-PRODUCED FILMS,

Descriptive Note:

Corporate Author:

RAND CORP SANTA MONICA CALIF

Personal Author(s):

Report Date:

1967-02-01

Pagination or Media Count:

9.0

Abstract:

The ongoing electrical activity of the nervous system is amenable to dynamic representation through films produced by computers in conjunction with automatic plotting equipment. Two such films are shown The first shows the firing of nerve cells and the transmission of nerve impulses along axonal pathways in a small interconnected group of neurons. Firings are represented by flashing disks of light, and the traveling impulses by moving spots of light, superimposed upon a schematic tracing of the anatomical background. The second film is a phase-plane representation of the fluctuations of membrane potential in a single nerve cell, as measured with a microelectrode. At each instant in time the membrane occupies a certain point in the plane, defined by the membrane potential itself abscissa value and its time derivative ordinate value. An animated plot of the trajectory of the membrane potential in phase space is shown, which includes a built-in persistence of vision to clarify some features of the motion. Different types of neuroelectric events, such as action potentials, postsynaptic potentials, and pacemaker activity, are characterized by distinct orbits in the phase plane. The applications of these techniques to neurophysiological research are outlined, and some practical problems are discussed, including programming techniques, film processing, and costs. The computer used is the IBM 7044, and the plotting device is the SC-4020. Author

Subject Categories:

  • Anatomy and Physiology
  • Computer Programming and Software
  • Computer Hardware
  • Bionics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE