System and method for detecting a thought and generating a control instruction in response thereto

• US 6,024,700 A
• Filed: 07/16/1998
• Issued: 02/15/2000
• Est. Priority Date: 07/16/1998
• Status: Expired due to Term

• Current Assignee: Think-A-Move Ltd.
• Original Assignee: Think-A-Move Ltd.
• Inventors: Nemirovski, Guerman G., Troussov, Gregory L.
• Primary Examiner(s): O'Connor, Cary
• Assistant Examiner(s): ASTORINO, MICHAEL C
• Application Number:
  US09/116,720
• Time in Patent Office: 579 Days
• Field of Search: 600/300, 600/544, 600/545, 600/378, 600/379, 607/136, 128/898, 128/899, 128/897, 128/905
• US Class Current: 600/300
• CPC Class Codes: A61B 5/16 Devices for psychotechnics using teaching or educational appliances G09B1/00 - G09B7/00; Testing reaction times ; Devices for evaluating the psychological state
• CPC Class Codes: Y10S 128/905 Feedback to patient of biological signal other than brain electric signal

Abstract

A method of detecting a thought and generating a control instruction corresponding to the thought includes detecting the thought by monitoring air pressure near a human ear when a user is thinking. In addition, the method includes providing a control instruction corresponding to the detected thought. A system for detecting a thought and generating a control instruction corresponding to the thought is also disclosed and includes a pressure sensor for sensing a pressure near a human ear when a user is thinking, wherein the sensor produces an electrical signal corresponding to the pressure. A processor processes the electrical signal to detect the thought, generates the control instruction in response to the detection, and sends a control instruction to an output peripheral which provides an output control function corresponding to the control instruction.

Claims

1. A method of detecting a thought and generating a control instruction corresponding to the thought, comprising the steps of:

detecting the thought by monitoring air pressure near a human ear when the human is thinking the thought; and

providing a control instruction corresponding to the detected thought.

2. The method of claim 1, wherein detecting the thought comprises the steps of:

placing a pressure sensor near the ear;

monitoring the air pressure with the pressure sensor;

converting detected air pressure changes to an electrical signal; and

processing the electrical signal to detect the thought.

3. The method of claim 2, wherein processing the electrical signal comprises the steps of:

converting the electrical signal to digital signal data;

processing the digital signal data to detect a presence of the thought; and

analyzing the processed digital signal data to determine the appropriate control instruction corresponding to the thought.

4. The method of claim 3, wherein processing the digital signal data comprises the steps of:

converting the digital signal data from a time domain to a frequency domain; and

processing the frequency domain data to distinguish between noise and the thought.

5. The method of claim 3, wherein processing the digital signal data comprises the steps of:

(a) separating the data into a plurality of data segments;

(b) analyzing a first data segment for the detection of a thought;

(c) analyzing a next data segment for the detection of a thought;

(d) analyzing all the analyzed data segments together for the detection of a thought; and

(e) repeating steps (c) and (d) until all the data segments are analyzed.

6. The method of claim 3, wherein processing the digital signal data comprises the steps of:

(a) selecting a segment of the digital signal data corresponding to a time window;

(b) converting a portion of the data segment from a time domain to a frequency domain;

(c) calculating a power spectrum for the converted data portion;

(d) calculating integrals of the power spectrum of the converted data portion for a plurality of frequency ranges;

(e) calculating a plurality of signal-to-noise ratios using the converted data portion integrals and integrals for a power spectrum of a noise signal for the plurality of frequency ranges;

(f) selecting a subset of the converted data portion integrals based on the signal-to-noise ratios; and

(g) evaluating the subset of converted data portion integrals to detect a presence of the thought.

7. The method of claim 6, further comprising the steps of:

selecting another segment of the digital signal data corresponding to another time window, wherein the time windows partially overlap; and

repeating the steps of (b)-(g) until a thought is detected or all the digital signal data has been evaluated.

8. The method of claim 6, wherein selecting a subset of the converted data portion integrals comprises the steps of:

comparing the signal-to-noise ratios for each of the frequency ranges to a predetermined threshold value;

selecting the converted data portion integrals corresponding to the frequency ranges if the signal-to-noise ratios are greater than the predetermined threshold value; and

using the selected subset of converted data portion integrals for subsequent analysis.

9. The method of claim 8, further comprising the steps of:

comparing a number of the converted data portion integrals in the selected subset to a threshold value; and

disregarding the portion of data if the number falls below a threshold value.

10. The method of claim 6, wherein evaluating the subset of integrals comprises the steps of:

correlating the subset of integrals with a plurality of integral sets corresponding to a plurality of thoughts; and

selecting one of the plurality of thoughts as the detected thought if the correlation between the subset of integrals and the integral set corresponding the one of the plurality of thoughts is greater than a predetermined threshold.

11. The method of claim 10, wherein the integral sets corresponding to the plurality of thoughts are generated by a user via a thought calibration process.

12. The method of claim 11, wherein the thought calibration process comprises the steps of:

(a) placing the air pressure sensor near the ear of a human;

(b) having the human think a particular thought at least one time;

(c) recording the air pressure during the thinking process; and

(d) generating a set of integrals corresponding to the particular thought for subsequent correlation.

13. The method of claim 12, comprising repeating steps (a)-(d) for a plurality of thoughts, thereby generating a set of integrals for a plurality of thoughts.

14. The method of claim 1, wherein monitoring the air pressure comprises the steps of:

placing a microphone near the ear; and

converting a change in air pressure to an analog electrical signal using the microphone.

15. A system for detecting a thought and generating a control instruction corresponding to the thought, comprising:

a pressure sensor for sensing a pressure near a human ear when the human is thinking the thought, wherein the sensor produces an electrical signal corresponding to the pressure;

a processor for processing the electrical signal to detect the thought and generating the control instruction in response to the detection; and

an output peripheral for receiving the control instruction from the processor and providing an output corresponding to the control instruction.

16. The system of claim 15, further comprising an analog to digital converter for converting an analog signal from the pressure sensor into a digital signal for subsequent processing by the processor.

17. The system of claim 15, wherein the pressure sensor comprises a microphone.

18. The system of claim 17, wherein the microphone is affixed near the human ear with an attachment means and substantially isolated from external pressure noise.

19. The system of claim 15, wherein the output peripheral is at least one of a display, a robot, a mechanical apparatus, a medical device and a game.

20. A method of detecting a thought, comprising detecting the thought by monitoring air pressure near a human ear.