Question: why does a goldfish only have a two second memory because other animals or fish could have the same size brain and don't have a two second memory

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  1. Actually Goldfish have a much longer memory than that. Its really only a myth that goldfish have such short memories. Just like most animals, goldfish can be trained when rewarded with food proving they have a memory that lasts.


  2. As James has pointed out, it really is a myth.

    However there is a condition called anterograde amnesia. If you have this it basically means you cannot committ new events to memory.