A concrete means for accurately detecting laughter such as 'suppressed laughter' which is hard to appear on an expression for quantifying. Provided is a concrete means for measuring changes with time of skin surface potential in the vicinity of a xyphoid of a subject or the vicinity of a region on a seventh costa located approximately 10 cm right from the xyphoid in an approximately horizontal direction and calculating changes with time of strength of each frequency of potential measurement waves which have been measured. In addition, the calculated data is mapped so that the changes with time of the strength of each frequency can be identified by color or the like, while one axis is specified to be a frequency axis and the other is a time axis. A concrete means for detecting the laughter of the subject by comparing with a prepared laughter reference pattern is provided.
LAUGHTER MEASUREMENT METHOD AND APPARATUS