How Does a Lie Detector Work? You hear about lie detectors all the time in police investigations, and sometimes a person applying for a job will have to undergo a polygraph test (for example, certain government jobs with the FBI or CIA require polygraph tests). The goal of a lie detector is to see if the person is telling the truth or lying when answering certain questions. When a person takes a polygraph test, four to six sensors are attached to him. A polygraph is a machine in which the multiple ("poly") signals from the sensors are recorded on a single strip of moving paper ("graph"). The sensors usually record: Sometimes a polygraph will also record things like arm and leg movement. When the polygraph test starts, the questioner asks three or four simple questions to establish the norms for the person's signals. Then the real questions being tested by the polygraph are asked. Throughout questioning, all of the person's signals are recorded on the m...
Communication Communication is a process by which people share information or transfer, convey or exchange ideas, opinions, feelings, facts or thoughts. Communication is very essential for everyone from all walks of life. To be able to communicate effectively is a skill. Decent communication skill enables us to pass information to another person and helps them to comprehend the messages and then interactions start. Information is transferred in diverse manners. 1) Verbal Communication 2) Nonverbal communication 3) Written communication 4) Visual communication Verbal communication is the use of language to transfer information only using a confident speaking voice. Active listening is another side of using verbal communication. Nonverbal communication is the use of body language, gestures, facial expressions to convey information on to another. Written communication is the act of writing, typing or printing symbols to communicate. Visual communication takes place by using char...