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The brain is processing various acts and thoughts of humans. Among the functions of the brain, decision making, reasoning and complex calculation are governed by the frontal lobe. If the FLA (Frontal Lobe Activity) is kept low for a long period of time, human reasoning and decision making are interrupted and anti-social behaviors can emerge which are hardly understandable in view of common people and it can result in serious problems. EEG (Electroencephalogram) was measured by using decision making stimuli which help determine the FLA and, with the index of the measured EEG data, the evoked conditions of subjects were compared and analyzed by utilizing EP (Evoked Potential) and Power Spectrum Analyzing. In the end, by the result of both methods, subjects with apparently low FLA index appeared, and, with the help of the obtained FLA index, critical values determining whether the FLA is in the normal range or not could be presented.