A method for determining social intimacy is described. The determination method comprises the steps of: detecting electrocardiogram (ECG) data on at least two subjects; detecting heart rhythm coherence (HRC) data from the ECG signals of the two subjects; and determining the relationship (intimacy) between the two subjects by comparing the HRC data on the two subjects.
METHOD FOR MEASURING SOCIAL RELATIONSHIP USING HEART RHYTHM COHERENCE (HRC)