when does a child develop long term memory
Memory development Infants at as early as 7-months-old can conceptually differentiate between categories such as animals and vehicles. Although infantsâ€™ concepts may be crude by adult standards, they still allow infants to make meaningful semantic distinctions. An example is that infants can differentiate between items belonging to a kitchen and those items belonging to a bathroom.[15] At the very least, these categories lay a foundation for early knowledge development, organizing information in storage and influence future encoding. Infants from 16 months old are able to draw on their semantic knowledge in generalization and inference. This knowledge can also be used by older toddlers, 24-month-olds, to facilitate acquisition and retention of new information. Their knowledge of causal ordering of events can be used to help to recall the sequence of events.[citation needed]
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Implicit memory Some of the child's primary experiences are positive and essential for the physical and mental growth of the child. Others may be traumatic: neglect, parental inadequacy or possible mental illness, physical or psychological violence, child abuse, even of a sexual nature, as well as the constant frustrations and disillusionments that lead the child to organize its defences and boost its phantasies. All these experiences cannot be repressed because the hippocampus, necessary for the explicit memory, which is in turn indispensable for repression, is not mature in early infancy (R. Joseph, 1996; Siegel, 1999). On the contrary, the amygdala, which promotes the organization of the implicit memory, undergoes an earlier maturation (R. Joseph, 1996). Therefore, these early experiences, including those that concern the organization of language, can only be deposited in this latter form of memory and they contribute to the formation of an early unrepressed unconscious nucleus of the self (Mancia, 2003a, in press).[12]