Brain's memory center remains active during 'infantile amnes
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One trait shared by all humans is that they don't remember specific life episodes that occurred before the age of 3 or 4. Many scientists have attributed this so-called "infantile amnesia" to a lack of development in the hippocampus, an area of the brain located in the temporal lobe that is crucial to encoding memory.

However, a new brain imaging study shows that infants as young as three months are already enlisting the hippocampus to recognize and learn patterns. The findings were published in the journal Current Biology.

For the new study, the Yale team used a new functional MRI (fMRI) technology to capture activity in the hippocampus in 17 babies, aged three months to two years old, as they were presented two sets of images on a screen. One set of images appeared as a structured sequence containing hidden patterns that could be learned. In the other, images appeared in a random order that offered no opportunity for learning. After the babies were shown these two sets of images several times, the hippocampus responded more strongly to the structured image set than to the random image set.

What might be happening is that as a baby gains experience in the world, their brain searches for general patterns that help them understand and predict the surrounding environment. This happens even though the brain is not equipped to permanently store each individual experience about a specific moment in space and time—the hallmark of episodic memory that is also lost in adult amnesia.

The size of the hippocampus doubles in the first two years of life and eventually develops the connections necessary to store episodic memories.

"As these circuit changes occur, we eventually obtain the ability to store memories," the author said. "But our research shows that even if we can't remember infant experiences later on in life, they are being recorded nevertheless in a way that allows us to learn from them."