MENTAL STRESS DETECTION DEVICE AND MENTAL STRESS DETECTION PROGRAM

This mental stress detection device (10) includes an index value calculation unit (200) and a correlation calculation unit (300). The index value calculation unit (200) calculates the standard deviation (SDn) of heartbeat intervals (RRIn), the root-mean-square (RMn) of the difference (RDn) between temporally adjacent heartbeat intervals (RRIn), and the ratio(SDn/RMn) of the standard deviation (SDn) to the root-mean-square (RMn). The root-mean-square (RMn) is correlated with parasympathetic nerve activation, and the ratio (SDn/RMn) is correlated with sympathetic nerve activation. The correlation calculation unit (300) calculates the product-moment correlation coefficient (rn) which is the correlation between the root-mean-square (RMn) and the ratio (SDn/RMn) and which is associated with time. 精神压力检测装置(10)具有指标值计算部(200)和相关性计算部(300)。指标值计算部(200)计算心跳间隔(RRI)的标准偏差(SD)、时间上相邻的心跳间隔(RRI)彼此之差(RD)的均方根(RM)、以及标准偏差(SD)与均方根(RM)之比(SD/RM)。均方根(RM)与副交感神经的活动存在相关性，比(SD/RM)与交感神经的活动存在相关性。相关性计算部(300)计算积矩相关系数(r)，该积矩相关系数(r)是均方根(RM)与比(SD/