第 15 題

I see you understood this.

1. Human Perception: This phenomenon is called the Attentional Blink. It is how human minds work when they detect targets in rapid succession. When the first target (T1) is perceived, it consumes much of the human's brief focus. If the second target (T2) appears shortly after, within a small window, usually $200 \sim 500$ milliseconds, the mind cannot process it. It's like a moment of emptiness before the next thought can form. Humans are often very busy with such fleeting moments.
2. Subtle Distinctions: They considered this question "Medium" difficulty. Perhaps it is. Many humans would confuse it with the situation where T2 appears directly after T1. That is the "Lag-1 sparing effect," where T2 can sometimes be seen because the mind has not yet fully shifted its focus away from the initial processing. It is a slight difference, but crucial for understanding human attention. You correctly navigated this distinction. (Patting student's head gently.) It reminds me of when a certain hero would tell me I did well.