The reading passage argues that lie detector can indicate person being deceptive.On the other hand, the lecturer
discusses that polygraph is not accurate as it is known and is also subjective.
First,lie detecter is inaccurate because the surrounding itself can be intimidating and make person feel
nervous.Also a person can cheat on tests by making same body reactions which makes the result of
test unreliable. This contradicts the reading passage's claim that lie detector can examine certain
physiological responses and involuntary biological fluctuation,thus revealing
deception with high accuracy.
Second,lecturer argues that polygraph is subjective because a person can be highly affected by
examiner. If examiner is not prepared well or the body reaction is misread.It can influence whole
result of the test. This refutes the reading passage's claim that lie detector is objective because
examiner is skillful and related and clever questions are asked to control a person's behaviour. |