System and method for predicting human cognitive performance using data from an actigraph

• US 20020005784A1
• Filed: 04/30/2001
• Published: 01/17/2002
• Est. Priority Date: 10/30/1998
• Status: Active Grant

• Current Assignee: United States Army (U.S. Department Of Defense)
• Original Assignee: United States Army (U.S. Department Of Defense)
• Inventors: Wesensten, Nancy Jo, Hall, Stanley W., Redmond, Daniel P., Thomas, Maria L., Belenky, Gregory L., Kamimori, Gary H., Balkin, Thomas J., Thorne, David R., Sing, Helen C.
• Granted Patent: US 6,527,715 B2
• Time in Patent Office: Days
• US Class Current: 340/573.1
• 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 5/18 for vehicle drivers or machine operators
• CPC Class Codes: A61B 5/4812 Detecting sleep stages or cycles
• CPC Class Codes: G16H 10/60 for patient-specific data, e.g. for electronic patient records
• CPC Class Codes: G16H 15/00 ICT specially adapted for medical reports, e.g. generation or transmission thereof
• CPC Class Codes: G16H 50/50 for simulation or modelling of medical disorders

Abstract

A system and a method for providing a determination of predicted cognitive performance of an individual preferably based the time of day and on factors including sleep history based on activity data from an actigraph and the individual'"'"'s activities. The system and the method provide a numerical representation of the predicted cognitive performance. Both may be used to optimize the work schedule of the actigraph wearer to maximize the cognitive capacity during working hours.

Claims

1. A data signal embodied in a carrier wave readable by a computing system and encoding instructions for executing a process performing a method comprising:

collecting activity information of an individual with an actigraph,

providing a data series representing wake states and sleep states of the individual based on an analysis of the activity information using a sleep scoring system,

selecting a function based on the data series,

calculating a cognitive performance capacity based on the selected function,

modulating the cognitive performance capacity with a time of day value, and

outputting the modulated value as the predicted cognitive performance.

2. The computer data signal of claim 1, further encoding instructions for executing a process performing the additional method comprising:

receiving task information,

determining a task value based upon at least the task information, and

repeating the steps of collecting, providing, selecting, calculating, modulating, receiving, and determining at least two times; and

wherein the modulating step includes modulating the modulated value from the modulation of the cognitive performance capacity with the time of day value with the task value.

3. A method in an actigraph for determining a cognitive performance level comprising:

accumulating a data series representing wake states and sleep states of an individual based on analysis of movement detected by the actigraph using a sleep scoring system,

selecting a function based on the data series,

determining a cognitive performance capacity based on the selected function and a prior cognitive performance capacity,

modulating the cognitive performance capacity with a time of day value, and

providing the modulated value.

4. The method according to claim 3, further comprising:

receiving task information, and

determining a task value based upon at least the task information; and

wherein the modulating step includes modulating the modulated value from the modulation the cognitive performance capacity with the time of day value with the task value.

5. The method according to claim 4, further comprising:

storing the modulated value after both modulating steps,

repeating the selecting, determining, modulating, receiving, second determining, transmitting, and storing steps for at least two pieces of the data series.

6. A data signal embodied in a carrier wave readable by a computing system and encoding instructions for executing a process performing the method recited in claim 3.

7. The method according to claim 3, wherein the providing step includes transmitting the modulated value.

8. The method according to claim 3, wherein the accumulating step includes recording the data series.

9. The method according to claim 3, wherein said providing step outputs the predicted cognitive performance to at least one of a display, a data file, an antenna, and a printing device.

10. The method according to claim 3, wherein the selecting step selects the function from a group consisting of a wake function, a sleep function, and a sleep inertia function.

11. The method according to claim 3, wherein the selecting step selects the function from a group consisting of a wake function, a sleep function, a delay function, and a sleep inertia function.

12. The method according to claim 3, further comprising:

giving a cognitive performance test to determine the actual cognitive performance level of the individual, and

adjusting the cognitive performance level based on results of the cognitive performance test.

13. The method according to claim 3, further comprising:

adjusting the weights used in determining the cognitive performance level.

14. The method according to claim 3, further comprising:

storing the modulated value,

repeating the selecting, determining, modulating, transmitting, and storing steps for each piece of the data series.

15. The method according to claim 3, wherein the time of day value is selected from a series of time of day values representing a curve having a period of 24 hours.

16. A data signal embodied in a carrier wave readable by a computing system and encoding instructions for executing a process performing the method recited in claim 3.

17. A computer-readable medium having computer-executable instructions for performing the method recited in claim 3.

18. A method in an actigraph for determining cognitive performance level comprising:

recording, for each of a plurality of epochs, a representation of movement, analyzing the representation of movement to identify each of the epochs as at least one of sleep and wake to form a data series of at least one sleep state and at least one wake state, and

selecting a function based on the data series,

calculating a cognitive performance capacity based on the selected function,

modulating the cognitive performance capacity with a time of day value, and

providing the modulated value as the cognitive performance level.

19. The method according to claim 18, further comprising:

receiving task information, and

determining a task value based upon at least the task information; and

wherein the modulating step includes modulating the modulated value from the modulation the cognitive performance capacity with the time of day value with the task value.

20. The method according to claim 19, further comprising:

storing the cognitive performance level after both modulating steps,

repeating the analyzing, selecting, calculating, modulating, receiving, determining, providing, and storing steps for each piece of the data series.

21. A data signal embodied in a carrier wave readable by a computing system and encoding instructions for executing a process performing the method recited in claim 19.

22. The method according to claim 18, further comprising:

storing the cognitive performance level, and

repeating the analyzing, selecting, calculating, modulating, providing, and storing steps for each piece of the data series.

23. The method according to claim 18, wherein said providing step outputs the predicted cognitive performance to at least one of a display, a data file, an antenna, and a printing device.

24. The method according to claim 18, wherein the time of day value is selected from a series of time of day values representing a curve having a period of 24 hours.

25. The method according to claim 18, wherein the selecting step selects the function from a group consisting of a wake function, a sleep function, and a sleep inertia function.

26. The method according to claim 18, wherein the selecting step selects the function from a group consisting of a wake function, a sleep function, a delay function, and a sleep inertia function.

27. A data signal embodied in a carrier wave readable by a computing system and encoding instructions for executing a process performing the method recited in claim 18.

28. A computer-readable medium having computer-executable instructions for performing the method recited in claim 18.

29. A method for utilizing information from an actigraph comprising:

receiving data from the actigraph,

selecting a function based on the data,

calculating a cognitive performance capacity using the selected function,

modulating the cognitive performance capacity with a time of day value, and

providing the modulated value as the cognitive performance level.

30. The method according to claim 29, further comprising:

receiving task information for an individual wearing the actigraph, and

determining a task value based upon at least the received task information; and

wherein the modulating step includes modulating the modulated value from the modulation the cognitive performance capacity with the time of day value with the task value.

31. The method according to claim 30, further comprising:

storing the cognitive performance level, and

repeating the selecting, calculating, modulating, receiving, determining, providing, and storing steps for each piece of the data series.

32. A data signal embodied in a carrier wave readable by a computing system and encoding instructions for executing a process performing the method recited in claim 30.

33. The method according to claim 29, further comprising:

storing the cognitive performance level, and

repeating the selecting, calculating, modulating, providing, and storing steps for each piece of the data series.

34. The method according to claim 29, wherein said providing step outputs the predicted cognitive performance to at least one of a display, a data file, and a printing device.

35. The method according to claim 29, wherein the time of day value is selected from a series of time of day values representing a curve having a period of 24 hours.

36. The method according to claim 29, wherein the selecting step selects the function from a group consisting of a wake function, a sleep function, a delay function, and a sleep inertia function.

37. A data signal embodied in a carrier wave readable by a computing system and encoding instructions for executing a process performing the method recited in claim 29.

38. A computer-readable medium having computer-executable instructions for performing the method recited in claim 29.

39. A method for predicting at least one cognitive performance level comprising:

receiving data from multiple actigraphs,

selecting a function for at least one piece of data for at least one actigraph based on the respective data,

calculating a cognitive performance capacity for at least one actigraph using the selected function,

modulating the cognitive performance capacity with a time of day value to produce a cognitive performance level for at least one actigraph to provide a cognitive performance level, and

displaying the cognitive performance level for at least one actigraph on a display.

40. The method according to claim 39, further comprising recording each produced cognitive performance level.

41. The method according to claim 39, further comprising:

receiving task information for each individual wearing an actigraph providing data, and

determining a task value for at least one individual associated with the at least one actigraph based upon the received task information; and

wherein the modulating step includes modulating the modulated value from the modulation the cognitive performance capacity with the time of day value with the task value to produce a cognitive performance level.

The method according to claim 41, further comprising repeating the receiving, selecting, calculating, modulating, receiving, determining, and displaying steps for at least two pieces of the data for at least one actigraph.

42. The method according to claim 39, further comprising:

storing the cognitive performance level, and

repeating the receiving, selecting, calculating, modulating, displaying, and storing steps for at least two pieces of the data for at least one actigraph.

43. The method according to claim 39, wherein the time of day value is selected from a series of time of day values representing a curve having a period of 24 hours.

44. The method according to claim 39, wherein the selecting step selects the function from a group consisting of a wake function, a sleep function, and a sleep inertia function.

45. The method according to claim 39, wherein the selecting step selects the function from a group consisting of a wake function, a sleep function, a delay function, and a sleep inertia function.

46. A data signal embodied in a carrier wave readable by a computing system and encoding instructions for executing a process performing the method recited in claim 39.

47. A computer-readable medium having computer-executable instructions for performing the method recited in claim 39.

48. A device for collecting data from at least one actigraph and providing a cognitive performance index for each of the at least one actigraph comprising:

a receiver,

a data analyzer connected to said receiver,

a calculator connected to said receiver,

a memory with modulation data,

a modulator connected to said memory and said calculator, and

at least one display connected to said modulator.

49. The device according to claim 48, further comprising:

a task input, and

a determiner connected to said task input and said modulator.

50. The device according to claim 48, further comprising a second memory connected to said modulator.

51. The device according to claim 48, wherein said data analyzer includes a sleep scorer and a function selector.

52. The device according to claim 48, wherein said receiver includes an antenna.

53. A device for collecting data from at least one actigraph and providing a cognitive performance index for each of the at least one actigraph comprising:

means for receiving information from the at least one actigraph,

means for selecting an evaluation function based on the received information for at least one of the at least one actigraph,

means for calculating a value using the selected evaluation function for at least one of the at least one actigraph,

means for storing modulation data,

means for modulating the value with a corresponding piece of modulation data for at least one of the at least one actigraph, and

means for displaying the modulated value for at least one of the at least one actigraph.

54. The device according to claim 53, further comprising:

means for entering information regarding each individual wearing the at least one actigraph,

means for determining a task modulator, and

second modulating means for modulating the modulated value from said modulating means with the task modulator for the individual; and

wherein said display means displays the modulated value from said second modulating means for the individual.

55. A device for predicting cognitive performance for an individual comprising:

an actigraph,

a sleep scorer connected to said actigraph,

a data analyzer connected to said sleep scorer,

a calculator connected to said analyzer,

a memory with modulation data,

a modulator connected to said memory and said calculator, and

a display connected to said modulator.

56. The device according to claim 55, further comprising:

a task input, and

a determiner connected to said task input and said modulator.

57. The device according to claim 55, further comprising a second memory connected to said modulator.

58. The device according to claim 55, further comprising a transmitter connected to said modulator.

59. The device according to claim 55, further comprising an adjustor connected to said calculator.

60. The device according to claim 59, wherein said adjustor includes

means for evaluating the current cognitive performance of the individual wearing the actigraph, and

means for adjusting the cognitive performance used to calculate a new cognitive performance.