Lara is trying to remember events from her life as an 18-month-old. However, as hard as she might try, she has no conscious memory of anything that occurred before her third birthday. This is likely due to the fact that her , which is involved in storing explicit memories, was not fully developed at that age.

hippocampus

Explanation:

Hippocampus is a structure of brain that remains embedded inside the temporal lobe. It has a role in developing and learning skills. This is a vulnerable structure which can be damaged by the different stimuli.

If the hippocampus get damaged because of illnesses for example. Alzheimer disease, or due to accident then the person may experience the loss of memory and loss of ability to retain long term memories.

The given situation, is an example of damage caused to the hippocampus then the explicit memories will not develop at the age of 18 months.

it depends on how much it could carry.