The goldfish's memory was indeed only seven seconds. This statement originated from a scientific experiment on goldfish. The experimenters placed goldfish in a tank and had them observe the food on a display board. When the experimenter slowly moved the food out of the display board, the goldfish did not react for seven seconds because their memory only lasted for seven seconds. In the next few seconds, the goldfish began to chase the food on the display board, proving that they could remember what had happened before. It should be noted that this experiment was based on the assumption that goldfish had a memory similar to humans. In fact, goldfish can store information in short-term memory like other mammals, but they can't keep it in long-term memory like humans. Therefore, we can say that the goldfish only has a memory of 7 seconds, but it is not impossible to recall the previous information.