Photic stimulation device, photic stimulation method, and program
AssigneeNagasaki Method & Co., Ltd.
InventorTsutomu Kamei
Life of this patent
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Abstract
Provided are an photic stimulation device, method, and program, including a waveform generation unit configured to shape a waveform of a frequency band including a part of a band of θ waves and a part of a band of a waves; a pulse modulation unit configured to generate a pulse waveform with duty adjusted on the basis of an amplitude of the waveform generated by the waveform generation unit; and a light exposing unit configured to irradiate a head with a red pulsed beam on the basis of an output of the pulse modulation unit.
Claims14
A photic stimulation device for a head comprising:
- a brain wave amplifier configured to perform A/D conversion on brain waves of an individual acquired with a sensor and amplify the brain waves;
- a control signal generation circuit configured to generate a control signal to control drive of LEDs on the basis of an output signal from the brain wave amplifier;
- and
- a light exposing unit including the LEDs that are driven on the basis of an output signal from the control signal generation circuit and expose the head with a light beam,
- wherein:
- the control signal generation circuit includes
- a first band-pass filter (BPF 1) configured to pass a frequency band including a part of a band of θ waves and a part of a band of α waves,
- an automatic gain control (AGC) limiter configured to suppress fluctuation in amplitude of the brain waves that depends on each individual,
- a second band-pass filter (BPF 2), and
- a feedback function of feeding back an output of the second band-pass filter (BPF 2) to the AGC limiter.
A computer-implemented method for causing a computer to execute photic stimulation of a head of a test subject, the computer-implemented method comprising:
- a control signal generation step of generating a control signal to control drive of LEDs on the basis of an output signal from a brain wave amplifier that performs A/D conversion on brain waves of an individual acquired with a sensor and amplifies the brain waves;
- and
- a light irradiation step of irradiating the head with a light beam from the LEDs that are driven on the basis of an output in the control signal generation step,
- wherein:
- the control signal generation step includes
- a process of a first band-pass filter (BPF 1) configured to pass a frequency band including a part of a band of θ waves and a part of a band of α waves,
- a process of an automatic gain control (AGC) limiter configured to suppress fluctuation in amplitude of the brain waves that depends on each individual,
- a process of a second band-pass filter (BPF 2), and
- a step of feeding back an output of the process of the second band-pass filter (BPF 2) to the AGC limiter.
Dependencies are inferred from the claim text.