Method of making a judgment on emotional positivity or negativity by detecting asymmetry of brain waves of left and right cerebral hemispheres

A computer storage medium for storing a computer program executed by a computer, wherein said computer program is composed of performing the functions of obtaining asymmetry ratio between the brain waves of the left and right cerebral hemisphere measured in a given unit time by means of electrodes attached to the left and right side of the scalp;

• calculating asymmetry ratio versus time at each frequency of said measured brain waves if the time taken for measuring said brain waves exceeds a given time interval;
• calculating an increase and a decrease of the asymmetry ratio of the previous step with time;
• and
• entering said an increase and a decrease into an artificial neural network to make a judgment on said emotional positivity or negativity.