It is defined as a scientific instrument purposely designed to record the psycho- physiological changes that occur within the body especially of lying when questioned.

• polygraphy

• lie detection

• polygraph

• lie detector

The scientific method of detecting deception with the aid of an scientific instrument.

• polygraphy

• lie detection

• polygraph

• lie detector

How shall the scientific method of detecting deception be administered?

• by interviewing the subject

• by observing the physical reaction of the subject during the test

• by asking question to the subject pertinent to the case under investigation.

• by observing the psycho-physiological reactions of the subject

The word polygraph is a combination of two words “poly” which means:

• Many

• Lie

• Writing chart

• Detection

He studied fear and its influence on the heart in which his observation

subsequently formed the basis of detection technique.

• Angelo Mosso

• Cesare Lombroso

• William M. Marston

• John Larson

He developed the sphygmomanometer and “scientific cradle” which was designed to measure the flow of blood while a person lay on his back in a prone position.

• Angelo Mosso

• Cesare Lombroso

• William M. Marston

• John Larson

He employed the first scientific instrument to detect deception,

which was known as hydrosphygmograph, an instrument to measures changes in pulse and blood pressure when suspects were asked about their involvement in a particular offense.

• Angelo Mosso

• Cesare Lombroso

• William M. Marston

• Leonarde Keeler

He was accorded the distinction of being the first person to utilize an instrument for the purpose of detecting lies.

• Angello Mosso

• Cesare Lombroso

• Leonarde Keeler

• Vittorio Benussi

He was considered as the father of the modern polygraphy.

He conducted numerous test for detecting deception utilizing the changes in systolic blood pressure. He also favored the discontinuous method of reading systolic pressure.

• Angelo Mosso

• Cesare Lombroso

• William M. Marston

• Harold Burtt

The person who lies in order to avoid the consequences of confession. He or she afraid of embarrassment to avoid ones and is a serious blow to his or her ego.

• Panic liar

• Psychological liar

• Black liar

• Pathological liar