even early bilaterians learned continually; the connections between neurons were strengthened and weakened with each new experience. But these early bilaterians never faced the problem of catastrophic forgetting because they never learned patterns in the first place. If things are recognized in the world using only individual sensory neurons, then the connection between these sensory neurons and motor neurons can be strengthened and weakened without interfering with each other. It is only when knowledge is represented in a pattern of neurons, like in artificial neural networks or in the cortex
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