ALT Image shows two panels of four horizontal brain images. The first row is labeled T1-weighted images and the second, T2-weighted images. The columns are labeled, 2 weeks, 3 months, 6 months, and 9 months. In the first row, the 2 week brain image shows white matter with a gray color and gray matter with a white color, a pattern that gradually shifts until by 9 months, white matter registers as white, and gray matter as gray. In the second row, the 2 week image shows clear contrast between gray and white, which is gone by 9 months.