×

Brain electrical activity mapping

  • US 4,421,122 A
  • Filed: 05/15/1981
  • Issued: 12/20/1983
  • Est. Priority Date: 05/15/1981
  • Status: Expired
First Claim
Patent Images

1. Apparatus for generating a topographic display of information on the electrical activity of the brain, said apparatus comprisinga plurality of electrical-activity transducers adapted for placement at spaced apart locations on the skull of a patient,stimulus means for repeatedly generating a sensory stimulus for the brain to produce at said transducers repeated segments of data each associated with one EP response, said stimulus means includingpseudorandom timing means for triggering successive said stimuli at times spaced apart by pseudorandom time intervals, and for determining each said pseudorandom time interval as a combination of a subinterval of fixed length and a subinterval of pseudorandomly determined length, each said fixed length subinterval comprising a pre-stimulus subinterval of predetermined length and a post-stimulus subinterval of predetermined length,averaging means connected to be responsive to said transducers for averaging said repeated segments to generate average segments for each transducer,processing means connected to be responsive to said averaging means for processing said average segments to generate one or more matrices, each element said one or more matrices representing information on the electrical activity of the brain at one location on the skull,display means connected to be responsive to said processing means for displaying said one or more matrices as topographic maps of the skull, each said matrix element forming a discrete point of said maps.

View all claims
  • 2 Assignments
Timeline View
Assignment View
    ×
    ×