Extensive research done in the field of psychology has
shown that eye blinking rate decreases when there is an
increase in the cognitive demand [1-2].
Lying is more cognitively demanding than telling the truth
because while lying the liar has to ensure that the lie can
pass off as the truth under various plausible scenarios and
thus has to think hard, to cover all the loopholes. This is
particularly evident when one has to give a false account of
one’s whereabouts, and thus is forced to make up a false
alibi [3].
The existing techniques of lie detection involve the use of
sophisticated equipment and complex techniques like brain
mapping etc. This paper proposes a method for lie detection
in which blink rate of the participant is measured in the
target period (lie detection period) and compared with the
threshold value denoting the normal blink rate of a person.