Mental states estimation with the variation of physiological signals

In this paper, we describe the consequences of mental conditions due to the variation of electrocardiogram, electroencephalogram and blood pressure using BIOPAC system. The different data sets are collected using BIOPAC system in which subjects were induced to undergo the specific sequence of mental condition or cognitive state. For getting physiological signals during different affective condition, we utilized power point slide show, video clips and question-answer method which elicit mental reactions from the subjects. Data was taken before and after four tasks that encompassed the Motor Action (MA), Thought (TH), Memory Related (MR), Emotion (EM). These measured values were analyzed using BIOPAC AcqKnowledge software. It was found that the effect of motor action and thought states are mainly on blood pressure while memory related and emotion state mainly affect the ECG measurement. The EEG mainly detects the signal of task performed by the specific brain region where the electrodes are placed. Here the electrodes are placed in occipital lobe region which gives mainly the variation in alpha amplitude of EEG with eyes closed and eyes opened. Alpha wave amplitudes vary with the subjects attention to mental tasks performed with eyes closed.