Emotions are very important for human existence, since
they control our ability of decision making, problem solving, communication and
negotiation and allow us to adapt to unpredictable changes in the environments.
There are many ways to classify emotions from simple pleasure/unpleasure to
detailed - happy, sad, disgust, fear, joy and anger. Electroencephalography(EEG - recording of electrical activity along the scalp) have been demonstratedeffective for differentiation between different emotional states. EEG signals
are commonly described in terms of rhythmic activity across different frequency
bands: a) delta (1-3 Hz), b) theta (4-7 Hz), c) alpha waves (8-13 Hz), d) beta
waves (13-30 Hz), e) gamma (30-100+ Hz). Analyzing the distribution of power in
respective frequency bands will reveal features that correspond to a particular
state of the human mind.
The ratio of slow waves to fast waves (SW/FW) has been
demonstrated to indicate emotions, behavioral and medical conditions. SW/FWratio was identified as a marker for motivational balance between the rewardand punishment systems. They were also shown to have a negative correlation
with fear and anxiety. Increase in Beta waves was correlated with fear.
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