Four images taken by an fMRI scan are shown. These are greyscale images of brain tissue with some regions of red, orange and yellow superimposed on top showing regions of brain activity. Each is a side view of a human brain inside a head, looking to the left. The two images on the left are from different patients imagining playing tennis, while the two images on the right are from patients imagining walking around the home. In each case one patient has a healthy brain and the other patient is in a non-responsive state. For each imagined task, the regions of brain activity are very similar in both patients.