This study will use advanced Magnetic Resonance Imaging (MRI) techniques to measure brain changes in ALS and related neurological conditions. Results from cognitive and neurological tests will be compared to the MRI. It is believed that these techniques will reveal changes in the brain that will help us understand normal brain function and the symptoms of neurological diseases as seen in ALS, as well to provide an objective measurement of degeneration (which is called a biomarker). This could improve not only the process by which new drugs for the treatment of neurological diseases are evaluated, but also how health care professionals address the needs of patients with these diseases.