Pain is a strange phenomenon. How painful a particular injury is can differ from person to person, even if the wound is the same. In order to determine how painful the injury is, it should be important to know the interaction between psychology and physiology. The scientists were particularly interested in a type of brain wave called alpha waves. Alpha waves are more prominent when relaxing with closed eyes, and they are reduced with open eyes, when drowsy, and during sleep. Alpha wave frequency appeared to predict pain sensitivity.
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