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Method and apparatus for analyzing an electro-encephalogram

  • US 5,181,520 A
  • Filed: 08/02/1990
  • Issued: 01/26/1993
  • Est. Priority Date: 12/22/1987
  • Status: Expired due to Fees
First Claim
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1. Apparatus for analyzing an electro-encephalogram (EEG) in which electrical signals derived from the EEG are applied to a threshold detector and threshold output signals are examined for a particular kind of brain activity, comprising:

  • input terminals for receiving at least two electrical signals respectively representing at least two channels of EEG which may be derived from different sides of a patient'"'"'s head, wherein the two electrical signals are analyzed substantially simultaneously;

    timing means for measuring time intervals between successive output signals produced by the threshold detector and for providing output values representing the time intervals;

    selecting means for selecting only those output values that represent time intervals longer than a predetermined minimum time;

    adding means for accumulating the selected output values representing time intervals occurring within a section of the EEG obtained during a time period of predetermined duration to produce a total value; and

    display means for producing a visible output including a plurality of total values derived respectively from the EEG channels side by side obtained during consecutive time periods of the predetermined duration.

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