| 摘要 |
A biofeedback diagnostic system includes a central processing and telemetry unit and a triggering sensor. The central processing unit in turn includes a situation-generating block for producing a series of stimuli and transmitting them in parallel to both a patient and an operator of the system via a dual peripheral device. The stimuli can be of magnetic, audio, visual, or other nature. The triggering sensor is designed to remotely acquire the patient's feedback to the transmitted stimuli and send a digital signal back to the central unit. Two biofeedback loops are formed: between the central unit, the patient, and the triggering sensor; and between the central unit, the patient, and the operator, who is interpreting the test results without involving the conscious reaction of the patient. The triggering sensor includes a noise generator to detect the patient's brainwaves and a detector channel equipped with a logoperiodic multi-turn spiral antenna to further enhance its sensitivity. To improve the patient's intuitive response, an optoelectronic element is placed of the patient's forehead and illuminated with a laser light at a frequency equal to that of the patient's brainwaves theta-rhythm. To isolate the torsion component of the laser light, a cavity resonator is employed with a volumetric chamber having a size being some multiple of the transmission frequency of about 1.45 GHz.
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