KEELER POLYGRAPH Meaning and
Definition
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The Keeler polygraph is a term predominantly used in the field of forensic psychology and criminal investigations. It refers to a type of polygraph instrument, which is a mechanical device used to assess whether an individual is being truthful or deceptive based on their physiological responses.
Developed by Leonarde Keeler in the 1930s, the Keeler polygraph is designed to measure changes in physiological variables such as blood pressure, respirations, and skin conductivity. It typically consists of several components including a blood pressure cuff, galvanometer, and pneumograph belts.
During a Keeler polygraph examination, the individual being tested is connected to the instrument via sensors that detect their physiological responses. The person conducting the examination poses a series of questions, alternating between neutral, relevant, and control questions. The belief is that truthful responses will elicit minimal physiological changes, while deceptive responses will result in noticeable fluctuations.
The data obtained from the Keeler polygraph examination is then analyzed by an expert polygraph examiner, who interprets the results to determine the individual's truthfulness or deception. It is important to note that the results of a Keeler polygraph examination are not admissible as evidence in a court of law, but they can serve as a tool for investigators to gather additional information or narrow down leads.
Overall, the Keeler polygraph is an instrument commonly used in forensic psychology for the purpose of assessing truthfulness and deceptive behavior through the analysis of physiological responses.
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Etymology of KEELER POLYGRAPH
The etymology of the term "Keeler polygraph" is as follows:
The word "Keeler" refers to John Augustus Larson Keeler, an American police officer and physiologist who invented the polygraph machine. John A. Larson was the first to combine the use of instruments such as the blood pressure cuff, a pneumatic tube to measure breathing, and a galvanometer to measure skin conductivity, into a single device. He developed this machine in the early 1920s with the intention of using it as a lie detection tool.
The term "polygraph" derives from the Greek words "poly" meaning "many" and "graph" meaning "writing" or "record". It signifies the function of the machine, which records multiple physiological responses concurrently, such as blood pressure, pulse rate, respiration rate, and skin conductivity, to detect signs of deception or stress.
