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为在脑的事件关联电位（ＥＲＰｓ）中分离出与数字回忆有关的成分，本文比较了２２名被试者在对等效的数字声音信号分别进行选择反应和选择心算作业中的靶和非靶信号的ＥＲＰｓ。结果发现在选择心算的ＥＲＰｓ中，在０．３～０．６ｓ期间出现一个显著的位于额－中央区的负电位成分，此负电位成分虽与近年报道的与记忆有关的Ｎ４００成分有相近之处，但也有明显不同的时－空特征。由于在上述二种作业中，对非靶信号的反应要求分别是不进行拨开关反应和累加心算，因此二者引起的脑活动均包括对信号的感知、判断和决策，差别仅在于在选择心算作业中，在判断为非靶信号后，为准备下一次可能的累加心算，需对上次累加的结果进行回忆，故上述负电位成分很可能与这种数字回忆过程有关。在选择心算的靶ＥＲＰｓ中，尽管存在着非常显著的正慢电位，但此负电位成分仍清楚可见，且与非靶ＥＲＰｓ中的负电位成分具相同的时空特征。选择心算靶ＥＲＰｓ中的正慢电位可能与脑进行认知活动时非特异系统中的主动抑制过程有关，其意义值得进一步研究。
To isolate components associated with digital recall in the event-related potentials (ERPs) of the brain, 22 subjects were compared in terms of their ability to perform selective responses to equivalent digital sound signals and to select the target and non-target Signal of ERPs. The results showed that in the selection of mental arithmetic ERPs, in the period of 0.3 ~ 0.6s appeared a significant amount in the frontal - central area of the negative component, although the negative component of memory and memory recently reported N400 components are similar However, there are also obviously different time-space features. As in the above two operations, the non-target signal response requirements are not dial switch reaction and the accumulation of mental arithmetic, the brain activity caused by both include signal perception, judgment and decision-making, the difference lies only in the choice of mental arithmetic In operation, after determining as a non-target signal, in order to prepare for the next possible cumulative mental arithmetic, the result of the last accumulated neurosensory neuron must be memorized. Therefore, the negative neuronal potential component may be related to this digital neuronal recall process. In selecting the target ERPs for mental arithmetic, this negative potential component is clearly visible despite the significant positive and slow potentials, and has the same spatio-temporal characteristics as the negative potential components of non-target ERPs. The selection of positive and slow potentials in the mental arithmetic target ERPs may be related to the active suppression process in the nonspecific system when the brain conducts cognitive activity, and its significance deserves further study.