The research reveals the significance of learning experiences over the first two-to-four years of human life, also known as “critical periods”.
In these periods memories are believed to be quickly forgotten in a phenomenon known as infantile amnesia — the inability of adults to retrieve episodic memories that took place during the first two-to-four years of life.
“Our findings reveal us that children’s brains need to get enough and healthy activation even before they enter pre-school,” said lead author Cristina Alberini, Professor at New York University in the US.
“Without this, the neurological system runs the risk of not properly developing learning and memory functions,” Alberini added.
Focussing on the brain’s hippocampus — a region of the brain necessary for encoding new episodic memories, the researchers found that the mechanisms of “critical periods” are fundamental for establishing these infantile memories.
During this critical period the hippocampus learns to become able to efficiently process and store memories for long-term.
If the hippocampus was inactive, the ability of younger rats to form latent memories and recall them later by reminders as they got older was diminished.Early in life, while the brain cannot efficiently form long-term memories, it is ‘learning’ how to do so, making it possible to establish the abilities to memorise long-term,” Alberini explained.