Conducting a polygraph examination

Lie detectors work with sensors, measuring the reactions of the body of a respondent and evaluating using a computer. When one is connected to the polygraph, they should answer truthfully to the questions that are asked. Here, the heart beat, galvanization, electrical conductivity of the skin and temperature is measured.

Lying causes stress, causing the skin to begin to sweat. This increases the electrical conductivity what is measured by two electrical contacts of the polygraph. These contacts are attached to the skin, placed under a weak tension. Increased sweating of the skin lets the amperage between the contacts raise up and is a clear indication of a lie! But in addition to the sweating of the skin, the human body reacts also with increased heart rate and increased respiration and temperature to stressful situations. These reactions / symptoms are also registered by the sensors and cover up false answers.

The Polygraph Expert complete set contains?

1. Data Aquisition Box: All phyisiological sensors (measurement probes) are connected here.
2. GSR Sensor: Measuring the human galvanic Skin Response with 2 electrodes that connected to the human fingers for inspection of the sympathetic nervous system activity. The electric circuit is very sensitive and show values between 2000 to 60,000 very high resolution measurements.
3. Temperature Sensor: Measuring the peripheral skin temperature in 0.01 C resolution when the skin temperature become lower - this is another indicator for the sympathetic nerve system activation.
4. Breathing sensor: A stretched very sensitive sensor based on silicon rubber cord that measure the human abdominal breathing amplitude and breathing ration per minute .
5. BVP Sensor (Pulse): HR heart rate and IBI (Inter Beat Interval, increasing the pace - measure pressure and stress)
6. BVP Sensor (Blood Pressure): Dynamically relative blood pressure changes that measure of extremely tiny BP changes that indicates fear, stress, pressure, fight or flight, etc.
7. BVP Sensor (Heart Rate Variability): HRV (Heart Rate Variability) time domain calculation and FFT spectrum analysis provides 40 different psychophysiology and physiological indicators concerning mental and emotional state of the central autonomic nervous system activity. The most 3 common parameters are: "Rumination thoughts" (VLF), "Stress activation" (HF), "relax activation" (LF)
8. USB cable: Connect the USB cable from the data box into your computer.

Lie Detection: How is it working?

1. Installation

Install the software easily accessible via the installation wizard and connect the polygraph via USB
with your PC or laptop.

The PC software enables the user to execute a professional lie detection test to anyone - very simple to use - very sophisticated technology include updating sequential questions (cold questions, hot questions and control question).

The tester can update any kind of surround or background of inside artifacts that influence the recording signals and the "artifacts time area" signed with a specific background color to indicate the situation.

During the test ,all the raw data signals from the sensors and the analysis information concerned the questions and answers will be recorded in specific local file that can be exported to excel files for detailed analysis.

2. Create questions

Think of questions that you always wanted to ask your opponent. Start with neutral questions. Type them first into the software and save your questions.

Hint: Just order yourself the 'lie detector + questions' and additionally get countless controversial questions, that are guaranteed to make ‘your test persons’ sweat! The questions are developed by an educated polygraph examiner to guarantee a professional polygraph lie detector test.

3. Connect the sensor elements

Now Attach the physological sensors to 'your proband' 

1. GSR Sensor: Measuring the human galvanic Skin Response with 2 electrodes that connected to the human fingers for inspection of the sympathetic nervous system activity. The electric circuit is very sensitive and show values between 2000 to 60,000 very high resolution measurements.
2. BVP HR Sensor: (Heart Rate, Blood Volume Pressure) HR heart rate and IBI (Inter Beat Interval, increasing the pace - measure pressure and stress)
3. Temperature Sensor: Measuring the peripheral skin temperature in 0.01 C resolution when the skin temperature become lower - this is another indicator for the sympathetic nerve system activation.
4. Breathing sensor: A stretched very sensitive sensor based on silicon rubber cord that measure the human abdominal breathing amplitude and breathing ration per minute .

Start polygraph and interview

And there you go: Start with the survey, start the Polygraph and the recording will begin.

Due to the combined hardware with software working which allows the user to receive simultaneously all seven signals from 6 sensors with the most accurate CAB information at 420 signals per second.

5. Evaluation

When you're done with the survey, you can evaluate the entire record. For each of the questions asked
the polygraph software shows you, if the previously given answers are the truth or whether the test person has lied according the changes in the graph.

Conclusion

The lie detector with real polygraph is characterized by its high compatibility, accuracy and ease of use. The polygraph software can be used with all Windows operating systems and is attached via USB connection with the measurement instruments. The lie detector is ready for use and easy to use after a few steps. Through the up to 6 measurement methods the results are very precise, which can be clearly and easily evaluated. 

Lie detectors are particularly well suited as a loyalty test for employee surveys, theft education or to detect a cheater.