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Although it himagesas already been known for some time that the brain does not remain rigid in its structure even in adulthood, scientists at the Max Planck Institute for Human Cognitive and Brain Sciences made a surprising discovery: The brain is not only able to adapt to changing conditions in long-term processes, but it can do so every month. The researchers observed that in women, in parallel to the rhythm of the level of oestrogen across their menstrual cycle, the structures of the Hippocampus vary — a brain area that is crucial for memories, mood and emotions.