Does a Polygraph instrument really detect lies?
According to my professor in college, the polygraph instrument does not directly detect a lie but records physiological responses when people are lying. For example, fear of detection, blood pressure, heart rate, changes in respiration can be recorded and compared with how they were before and after the question is asked.
People use polygraph in various ways, such as criminal investigation and employee screening, but the validity of this remains to be questioned. Are the changes in physiological responses entails that it is a lie? Or could it have been produced by other conditions? There are a lot of things to consider if you want to test the validity of this evidence.
What are your thoughts on this? Do you believe in the results of a polygraph test?
Does a Polygraph instrument really detect lies?
According to my professor in college, the polygraph instrument does not directly detect a lie but records physiological responses when people are lying. For example, fear of detection, blood pressure, heart rate, changes in respiration can be recorded and compared with how they were before and after the question is asked.
People use polygraph in various ways, such as criminal investigation and employee screening, but the validity of this remains to be questioned. Are the changes in physiological responses entails that it is a lie? Or could it have been produced by other conditions? There are a lot of things to consider if you want to test the validity of this evidence.
What are your thoughts on this? Do you believe in the results of a polygraph test?