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Human memories remain in the same way the akashic records do. But if they aren't part of some significant structure they are meaningless. To elaborate, the idea of brining language with you to the next incarnation or recover it from the past incarnation. It seems that the "memory of language" is there but the new body doesn't have the wiring, so you have to relearn it even if you know it. This would be the case with any human level knowledge. If it's more general in nature it's spiritually higher and abstract, then it's applicable but it still won't exist at a more physical level without formation, which takes time and effort just the same.