Recently, there are more concerns about the issue of the unit mechanism of human temporal information processing. Recent studies showed that the Mismatch Negative wave (MMN) was related with automatic processing, while Contingent Negativity Variation (CNV) related with control processing, and omitted stimulus potentials (OSPs) corresponded with both automatic and control processing. Studies about all of the three ERPs proved the existence of both processing. Further studies should pay more attention on exploring the duration processing mechanism rather than on the segmentation point of automatic and control processing.