The researchers looked at brain images of over 10,000 healthy adults ... at 70, with brain-cell function that could increase the risk of dementia; and at 78, with immunity and inflammation.

Colored green above, a songbird's cortex, which dominates the bird brain anatomy, functions similarly to ... seen in the images below). The darker blue area is called the midbrain.

In the case of functional MRI (fMRI), the system produces images of the brain’s function, indicating whether the activity of neurons is increased or decreased in specific parts of the brain ...