System and method for calibrating and normalizing eye data in emotional testing

• US 8,986,218 B2
• Filed: 08/12/2013
• Issued: 03/24/2015
• Est. Priority Date: 07/09/2008
• Status: Active Grant

• Current Assignee: Imotions A/S (Smart Eye AB)
• Original Assignee: Imotions A/S (Smart Eye AB)
• Inventors: De Lemos, Jakob, Jensen, Ole Baunbaek, Sadeghnia, Golam Reza
• Primary Examiner(s): Hindenburg, Max
• Assistant Examiner(s): Pani, John
• Application Number:
  US13/964,624
• Publication Number:
  US 20130331729A1
• Time in Patent Office: 589 Days
• Field of Search: 600/300, 600/558, 351206-208, 128/898, 705/7.32
• US Class Current: 600/558
• CPC Class Codes: A61B 3/112 for measuring diameter of pupils
• CPC Class Codes: A61B 3/113 for determining or recording eye movement
• CPC Class Codes: A61B 5/1104 induced by stimuli or drugs; A61B5/1102 takes precedence; investigating medicinal preparations G01N33/15
• 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: A61B 5/163 by tracking eye movement, gaze, or pupil change
• CPC Class Codes: A61B 5/165 Evaluating the state of mind, e.g. depression, anxiety
• CPC Class Codes: A61B 5/6821 Eye
• CPC Class Codes: G06V 40/19 Sensors therefor

Abstract

A system and method is provided for calibrating and normalizing eye data of one or more subjects prior to and/or during emotional testing of the subjects. In particular, initially performing one or more calibration or normalization operations prior to an emotional test of a subject may result in accurate evaluations of emotional responses based on measurements of eye data. Additionally, further calibration or normalization performed during the emotional test may be used to refine the initial calibration or normalization, further increasing the accuracy of the evaluated emotional responses.

Claims

1. A computer-implemented method of measuring eye data of a subject during emotional testing, the method being implemented by a computer executing one or more applications, the method comprising:

obtaining, by the computer, a test stimulus;

obtaining, by the computer, a conditioning stimulus, the conditioning stimulus comprising scrambled pixels of the test stimulus;

causing, by the computer, the conditioning stimulus to be presented to a subject via a display device operatively coupled to the computer;

causing, by the computer, the test stimulus to be presented to the subject via the display device;

receiving, by the computer, from an eye-tracking device operatively coupled to the computer, eye data collected from the subject by the eye-tracking device while the subject viewed the test stimulus; and

processing, by the computer, the collected eye data to determine the subject'"'"'s emotional response to the test stimulus.

2. The method of claim 1, further comprising:

causing, by the computer, at least one stimulus to be presented to the subject, via the display device, prior to the conditioning stimulus, to induce a desired emotional state in the subject.

3. The method of claim 1, further comprising:

determining and recording, by the computer, an emotional baseline level of the subject prior to causing the conditioning stimulus to be presented to the subject.

4. The method of claim 1, wherein the conditioning stimulus has a same overall light intensity as the test stimulus, such that any ocular response to the test stimulus is based primarily upon the subject'"'"'s emotional response to the test stimulus as opposed to a change in light intensity between the conditioning stimulus and the test stimulus.

5. The method of claim 1, further comprising:

causing, by the computer, a visual stimulus to be presented to the subject, via the display device, prior to presenting the conditioning stimulus to the subject, wherein the visual stimulus includes a fixation indicator for fixing the subject'"'"'s gaze at a predetermined location.

6. The method of claim 1, wherein the collected eye data includes pupil data.

7. The method of claim 1, wherein the collected eye data includes blink data.

8. The method of claim 1, wherein the collected eye data includes gaze data.

9. The method of claim 1, wherein the eye-tracking device is integrated with the display device.

10. A system for measuring eye data of a subject during emotional testing, the system comprising:

a computer programmed to execute one or more applications that, when executed, cause the computer to;

obtain a test stimulus;

obtain a conditioning stimulus, the conditioning stimulus comprising scrambled pixels of the test stimulus;

cause the conditioning stimulus to be presented to a subject via a display device operatively connected to the computer;

cause the test stimulus to be presented to the subject via the display device;

receive, from an eye-tracking device operatively coupled to the computer, eye data collected from the subject by the eye-tracking device while the subject viewed the test stimulus; and

process the collected eye data to determine the subject'"'"'s emotional response to the test stimulus.

11. The system of claim 10, wherein the computer is further caused to:

induce a desired emotional state in the subject by causing at least one stimulus to be presented to the subject, via the display device, prior to the conditioning stimulus.

12. The system of claim 10, wherein the computer is further caused to:

determine and record an emotional baseline level of the subject prior to causing the conditioning stimulus to be presented to the subject.

13. The system of claim 10, wherein the conditioning stimulus has a same overall light intensity as the test stimulus, such that any ocular response to the test stimulus is based primarily upon the subject'"'"'s emotional response to the test stimulus as opposed to a change in light intensity between the conditioning stimulus and the test stimulus.

14. The system of claim 10, wherein the computer is further caused to:

present to the subject, via the display device, a visual stimulus prior to the conditioning stimulus, wherein the visual stimulus includes a fixation indicator for fixing the subject'"'"'s gaze at a predetermined location.

15. The system of claim 10, wherein the collected eye data includes pupil data.

16. The system of claim 10, wherein the collected eye data includes blink data.

17. The system of claim 10, wherein the collected eye data includes gaze data.

18. The system of claim 10, wherein the eye-tracking device is integrated with the display device.

19. A computer program product to measure eye data of a subject during emotional testing, the computer program product comprising:

one or more tangible, non-transitory computer-readable storage devices;

program instructions, stored on at least one of the one or more tangible, non-transitory computer-readable tangible storage devices that, when executed, cause a computer to;

obtain a test stimulus;

obtain a conditioning stimulus, the conditioning stimulus comprising scrambled pixels of the test stimulus;

cause the conditioning stimulus to be presented to a subject via a display device operatively connected to the computer;

cause the test stimulus to be presented to the subject via the display device;

receive, from an eye-tracking device operatively coupled to the computer, eye data collected from the subject by the eye-tracking device while the subject viewed the test stimulus; and

process the collected eye data to determine the subject'"'"'s emotional response to the test stimulus.