The changes that happen in the mommy brain are the most profound and permanent of a woman's life. For as long as her child is living under her roof, her GPS system of brain circuits will be dedicated to tracking that beloved child. Long after the grown baby leaves the nest, the tracking device continues to work. Perhaps this is why so many mothers experience intense grief and panic when they lose day-to-day contact with the person their brain tells them is an extension of their own reality.