Brain diseases like Alzheimer's and Parkinson's can have a severe impact on people later in their life, and one of the biggest problems is detecting them early enough for effective treatments to begin. One way that doctors check for early signs is through patient's drawing irregularities, i.e. distortions in shapes and how long it takes to finish a drawing. Unfortunately, these irregularities, like signs of brain diseases, can be easily overlooked due to a doctor's opinion. But MIT researchers think a digital pen with tracking software could help improve detection.