A set of electronic devices that employ psychologists, constantly expanding. In addition to the Polygraph ("lie detector"), there are other devices to test the emotional state of the person. Hallmark modern psychologists is an electronic visual and sound readings, the ability to connect to the computer and transfer data over long distance. A simple device of this type is easy to do, having elementary skills build the circuits.
Heart e the psychologist will serve as well known to all motorists element alarm-swing sensor swing. Work such sensors can be observed, touching the car installed alarm: the slightest rocking of the body - and now the whole district is filled a deafening howl. The sensor device is clear from the figure. When the rocking of the car body swings also thin long rod of the pendulum, which leads to the closure of the contacts. The sensitivity of the sensor can usually to regulate, for example, by means of a movable controller. The position controller increases or decreases the amplitude of oscillations due to the change in the length of the movable part of the pendulum.
The question may arise, what does all of this have to do with psychological the human condition? It turns out that the most direct. Shaking your hands or no - that's as old as the world, the way to determine the level of stress, excitement, a person's ability to control their bodies, "to control yourself". Attaching automotive sensor swing to one wrist of the examinee or two sensors to each of the brushes, ask them horizontally to stretch his arms in front of him. A visual or audible alarm will formalize shake hands and even sets the intensity of these involuntary movements. Of course, hands can tremble for different reasons, particularly after intense exercise. And yet, ceteris paribus, the mentioned method of control "tremor" (as called rapid rhythmic movements, shaking of body parts, limbs) allows you to obtain additional information of a psychological nature.
Pendulum sensor: 1 - body; 2 - holder, 3 for the rod of the pendulum; 4 - a; 5 - a guide slot; 6 - movable controller; 7 - terminal; 8 - connecting wire; 9 - the fastening eyelet
E-the psychologist of this design is convenient for its simplicity and, however, the ability to connect various additional devices to improve informative tests. Here are a few examples. Nothing worth collecting the scheme, consisting of a pendulum sensor swing, batteries, and LEDs buzzer, connected in series. With a very simple design like this "psychologist" is already a lot of talk about the presence and intensity of tremor language visual and sound signals. You can make it even easier. If you have a digital type multimeter Mastech M-838, it is equipped with a so-called function "sound continuity test". Button to set the multimeter to "audible continuity test" and connect the probes to the terminals of the sensor.
When the contact closure sensor buzzer multimeter will emit a characteristic beep - tremor appeared!
There is a possibility to connect a device to the computer on which must have software for recording and editing sound (for example, redistributable sound file editor Audacity), and post next with buzzer microphone. Writing "sounds tremor" on the computer, you will be able to analyze the frequency of hand-shake and the change in this parameter over time. Try to ask the subject of different questions, and you will see how depending on the complexity of the issue change the characteristics of the tremor. What is not a "polygraph"?
If consistent with the swing sensor swing to connect to the sound card computer generator, sound frequency, the tremor signal can be written without the use of a buzzer and microphone. Easy even to provide signal transmission long distances in those cases when the subject is in another geographical point. There are many options, including the use of Skype (also free) and the technology of IP telephony. Of course, for signaling tremor at large distances can be used as normal, and a mobile phone.
The scope of application of electronic devices-psychologists is expanding day by day. All often they are used in such fields of human activity, both physical culture and sport. So the definition of tremor and its indicators suggests professionals how the athlete controls his body, controls his emotions, how quickly he can settle down and relax after intense physical load. All this helps to organize the training process and, in ultimately, to achieve high performance.