Abstract
Polygraph is tool which is used detect lie spoken by a person in various situation. It is also used as best tool for investigation purpose to check whether a person speaks truth or lying when answering to certain questions shoot to them. by calculating the EEG signals one can find the relationship between the lying and frontal lobe during performing certain task. For bio-signal classification multiplayer neural network are used. Short-time Fourier transform (STFT) are calculated for each channel for each group subject. To differentiate between deception and truth types of EEG multi-layer perception (MLP) is used. The activation of the frontal cortex is associated with mental processes. A set of questions are framed as stimulus for the subject. The main aim is to find difference in state of truth and deception by calculating the alpha waves from two midline electrodes and four frontal electrodes.
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