Brain activity estimation device

1. A brain activity estimation device comprising:

a facial skin temperature acquisition element arranged and configured to detect a skin temperature of at least part of a human face, and to acquire facial skin temperature data including detected temperature data and location data of a detection region thereof in a time series manner; and

a brain activity estimation element arranged and configured to estimate human brain activity based on the facial skin temperature data acquired by the facial skin temperature acquisition element,

the brain activity estimation element being further arranged and configured to

decompose the facial skin temperature data into a plurality of components by singular value decomposition, principal component analysis, or independent component analysis,

extract a component as a determination component from among the plurality of components, the component having an amplitude of a component waveform thereof that is correlated to changes at a time when a brain is at rest and a time when a brain is stimulated, and

determine whether the determination component is related to the human brain activity based on a presence or absence of a temperature change in a prescribed region of the human face.

2. The brain activity estimation device according to claim 1 , wherein

the facial skin temperature data includes data for a period in which the human is presented with a brain function-stimulating task, and

the brain activity estimation element is further arranged and configured to evaluate whether a correlation exists in the plurality of components by designating a period during which the person is not being presented with the brain function-stimulating task as the time when the brain is at rest, and by designating a period during which the person is being presented with the brain function-stimulating task as the time when the brain is being stimulated, and

the brain activity estimation element is further arranged and configured to extract a component evaluated as having the correlation as the determination component from among the plurality of components.

3. The brain activity estimation device according to claim 1 , wherein

the brain activity estimation element is further arranged and configured to

create facial skin temperature data in which the temperature data included in the facial skin temperature data acquired at each of prescribed points in time is converted to relative temperature data, and

decompose each of the acquired facial skin temperature data and the created facial skin temperature data into a plurality of components by singular value decomposition, principal component analysis, or independent component analysis.

4. The brain activity estimation device according to claim 1 , wherein

the facial skin temperature acquisition element includes an infrared thermography device.

5. The brain activity estimation device claim 1 , wherein

the prescribed region includes at least one of a paranasal sinus peripheral region and a forehead.

6. A brain activity estimation method, comprising:

detecting a skin temperature in at least part of a human face, and acquiring facial skin temperature data that includes detected temperature data and location data of a detection region thereof in a time series manner; and

estimating human brain activity based on the facial skin temperature data acquired,

the estimating human brain activity including

decomposing the facial skin temperature data into a plurality of components by singular value decomposition, principal component analysis, or independent component analysis,

extracting a component as a determination component from among said plurality of components that were decomposed, the component having an amplitude of a component waveform thereof that is correlated to changes at a time when a brain is at rest and a time when a brain is stimulated, and

determining whether the determination component that is extracted is related to the human brain activity, based on a presence or absence of a temperature change in a prescribed region of the human face.

7. The brain activity estimation device according to claim 2 , wherein

the brain activity estimation element is further arranged and configured to

create facial skin temperature data in which the temperature data included in the facial skin temperature data acquired at each of prescribed points in time is converted to relative temperature data, and

decompose each of the acquired facial skin temperature data and the created facial skin temperature data into a plurality of components by singular value decomposition, principal component analysis, or independent component analysis.

8. The brain activity estimation device according to claim 7 , wherein

the facial skin temperature acquisition element includes an infrared thermography device.

9. The brain activity estimation device according to claim 8 , wherein

the prescribed region includes at least one of a paranasal sinus peripheral region and a forehead.

10. The brain activity estimation device according to claim 2 , wherein

the facial skin temperature acquisition element includes an infrared thermography device.

11. The brain activity estimation device according to claim 2 , wherein

the prescribed region includes at least one of a paranasal sinus peripheral region and a forehead.

12. The brain activity estimation device according to claim 3 , wherein

the facial skin temperature acquisition element includes an infrared thermography device.

13. The brain activity estimation device according to claim 3 , wherein

the prescribed region includes at least one of a paranasal sinus peripheral region and a forehead.

14. The brain activity estimation device according to claim 4 , wherein

the prescribed region includes at least one of a paranasal sinus peripheral region and a forehead.