The interaction between time and face stimulus was significant [F (3,51) = 3.84, p = 0.015, η_p² = 0.18]. The simple effect test showed that in the incomplete condition, the P1 amplitude was much smaller in Test 3 than in Test 2 (3.25 ± 0.49 μV vs. 3.92 ± 0.55 μV, p = 0.042), while under complete conditions, the amplitude in Test 4 (4.24 ± 0.49 μV vs. 5.49 ± 0.48 μV, p = 0.003) was smaller than that in Test 2 (Figure 6 and Table 2). No other significant main effects or interactions were found.