Effect of Early Component of Event-related Potentials on Reaction Time

We investigated the influence of the preceding deviant stimulus on the processing of the subsequent stimulus when the deviant of the preceding stimulus elictied in situations in which the stimulus is presented consecutively, with respect to mismatch negativity(MMN) and P300 potential. As a result, we found a decrease of reaction time in resuponse to the SI deviant, which was different from that in previous studies. It was observed that MMN amplitudes corresponded to that of P300. Morever, we obtained a decrease of P300 latency, which was not correlated with the magnetude of the deviant. These findings sugest that the preceding deviant stimulus influences the processing of the subsequent stimulus when the deviant of the preceding stimulus is elicited in the situations in which the stimulus is presented consecutively