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In page Childhood amnesia:

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Many factors affect memory in humans, including gender and culture.[1][2] Differences in early memory between these groups can tell us about potential causes and implications of childhood amnesia. The individual differences mean that elaborative parenting styles and emphasis of cultural history when teaching children may result in recollection of earlier childhood memories.[citation needed] This suggests that childhood amnesia offset is modifiable by parenting and teaching styles and is therefore not exclusively predetermined or entirely biological.