The child's and adult's brains respond to speech in the same way This video shows 3D MRI scans of a child's (left) and adult's (right) head, showing activity in the language regions of the brain (blue) as they listen to speech. The scans reveal different layers of tissue, starting with the skin, muscles, bones, and then the brain itself. Although the three-month-old cannot yet speak or understand, we can conclude that their language areas are still being activated by speech. Albeit to a lesser degree.