To clarify the mechanism of serial dependence in number perception, a research team conducted two tests, independently asking subjects to estimate the number of coins, or to estimate the value of those coins, shown on-screen for half a second. The results showed that serial dependence was confirmed in both tasks and that the most significant effect on serial dependence was not caused by the last stimuli, but the subjects last response. These results indicate that higher-order cognitive processing has a greater influence on the occurrence of serial dependence.