A strange mouse study suggests that the brain isn't a 'blank slate' at birth, waiting for memories to be written onto it. Instead, it appears to start life 'full' and messy, optimizing itself as it learns. Neuroscientists at the Institute of Science and Technology Austria (ISTA) examined mouse brains from birth to adulthood, focusing on the complexity of a key memory circuit in the hippocampus . This region of the brain is involved in spatial memory and in consolidating short-term memories into

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