Accession Number : ADP008669

Title :   Parallel Implementations of Neural Networks: Electronics, Optics, Biology,

Corporate Author : BELL COMMUNICATIONS RESEARCH INC MORRISTOWN NJ

Personal Author(s) : Alspector, Joshua

Report Date : 22 MAY 1992

Pagination or Media Count : 5

Abstract : A DARPA report notes that the human cerebral cortex is comprised of 100 billion neurons, each having about 1,000 dendrites that form about 100 trillion synapses. If you multiply that by its operating frequency of about 100 Hz, you get 10,000 trillion interconnections per second. These last two numbers (10 to the 14th power connections and 10 to the 16th power connections per second) form the basis for the graph in the DARPA report labeled Computional Requirements. The cortex not only has this prodigious capacity but dissipates about 10 watts, weighs 3 pounds, covers 0.15 square meters and is about 2 millimeters thick. To say it is something substantial for designers of neural systems to shoot for is a considerable understatement. Adapted from the report, uses roughly this two-dimensional methodology to measure the capacity of various biological organisms and requirements for certain applications such as robotics or speech. Many important dimensions are missing such as ability to learn in order to endow those connections with knowledge, the speed at which those connections can be updated, the density of connections, the power dissipated, and scalability at a system level.

Descriptors :   *NEURAL NETS, *CEREBRAL CORTEX, INSTALLATION, MOTOR NEURONS, TWO DIMENSIONAL, ROBOTICS, SPEECH, ELECTRONICS, OPTICS, BIOLOGY.

Subject Categories : Cybernetics
      Anatomy and Physiology

Distribution Statement : APPROVED FOR PUBLIC RELEASE