SENSATION-COGNITION COMPUTER EMPLOYING "t" TEST CALCULATIONS

• US 3,780,724 A
• Filed: 08/20/1971
• Issued: 12/25/1973
• Est. Priority Date: 08/20/1971
• Status: Expired due to Term

• Current Assignee: Erwin Roy John
• Original Assignee: Erwin Roy John
• Inventors: John, Erwin Roy
• Primary Examiner(s): Kamm, William E.
• Application Number:
  US05/173,604
• Time in Patent Office: 858 Days
• Field of Search: 128/2.1B,2.1R 235/150.53,151.13
• US Class Current: 600/544
• CPC Class Codes: A61B 5/316 Modalities, i.e. specific diagnostic methods
• CPC Class Codes: A61B 5/377 using evoked responses

Abstract

A patient who may be unable to cooperate is tested for auditory, visual and somatosensory perception. The apparatus includes an electroencephalograph, programmed stimulators, a t test computer including an average response computer and a recorder. Evoked responses of the patient are elicited and the patient'"'"''"'"'s shortterm memory is tested.

Claims

1. Apparatus for the testing of a subject which includes a plurality of electrodes adapted to be connected to the head of the subject to monitor his brainwaves, an amplIfier connected to said electrodes to amplify said brainwaves, an electroencephalograph connected to said amplifier, switching means connected to said electroencephalograph, a t test computer whose input is connected to the output of said electroencephalograph, said computer having a first squaring circuit, an average response computer having a plurality of channels and being connected to said first squaring circuit, a second squaring circuit connected to said average response computer, a first differential circuit connected to said average response computer and said second squaring circuit, a first divider circuit connected to said first differential circuit and to said average response computer, a summing circuit connected to said first dividing circuit, a square root circuit connected to said summing circuit, a second divider circuit connected to said square root circuit, a second differential circuit connected to said second divider circuit and to said average response computer, and an absolute value circuit connected to said second divider circuit, a recorder connected to said '"'"''"'"''"'"''"'"'t'"'"''"'"''"'"''"'"' test computer to record the averaged brainwaves, a programmed timer connected to and controlling said switching means, and stimulus means connected to said programmed timer and controlled by it.

2. The apparatus for the testing of a subject as in claim 1 wherein the programmed timer has stored therein a plurality of alternative programs and the apparatus includes a program switching mechanism whereby one of the alternative programs may be selected.

3. The apparatus of claim 1 and including means to set within the t test computer the number of sample sweeps N and the level of significance P to provide a '"'"''"'"''"'"''"'"'go - no go'"'"''"'"''"'"''"'"' signal to said recorder.

4. The apparatus of claim 1 and also including variable setting means to set within the t test computer the t test standard value and the maximum number of sample sweeps N, upon attainment of which standard t value a control signal is provided by said t test computer to said programmed timer.

5. An apparatus as in claim 1 wherein within the said t test computer said first squaring circuit includes two squaring means and wherein two sampling lines are connected to the output of said electroencephalograph, the said averaging circuit of said t test computer is a four-channel average response computer whose inputs are the said two sampling lines and the said two squaring means, and the inputs of which said two squaring means are connected to said sampling lines.