A device for determining the emotional state. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Medicine
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A device for determining the emotional state of a person (polygraph) is used in investigative practice. Thus, in the book by J. Voitsekhovsky "Radio-electronic toys" it is established that lies and denial of guilt by criminals are accompanied by nervous tension, leading to various physiological phenomena: increased blood pressure, etc.
Modern devices allow approximately 85% of cases to correctly evaluate answers. The device consists of a set of sensitive measuring devices connected to pressure sensors. An elastic bracelet with such a sensor, fixed above the elbow, allows you to register on the recorder a record of changes in pulse and pressure. The sensor, placed at chest level, allows you to register the rhythm of breathing. However, in amateur radio practice it is much easier to register a change in skin resistance on the hands or on the wrist.
Electrodes in the form of electrically conductive strips about 20 mm wide are attached to the skin (wrists, palms, forehead) with an adhesive tape at a distance of 10-15 mm. The subject is asked a series of questions to which he must answer "yes" or "no". Having deciphered the record on the recorder or by the deviation of the instrument's pointer, they determine the body's reaction to the correct answers and to obviously false ones. The scheme (Fig. 6.39) of a simplified device has a high sensitivity, allows you to note even a slight excitement of the subject in the case of deliberate lies and responds to changes in skin resistance.
In the normal state, the skin resistance is 3 ... 100 kOhm, and under the influence of excitation it changes by about 5%. A galvanometer or a recorder is connected to the output terminals of the device. The sensitivity of the device is regulated by the resistor R1.
The device is suitable for organizing psychological tests and quizzes.
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