Our goal is to understand why the cognitive and mood symptoms of Parkinson's disease can vary so drastically across patients. This requires the cognitive phenotyping of patients, which includes recording their responses to various tasks and questionnaires. To do this effectively, we need a large, heterogenous sample of individuals; which is why we turned to online research. We developed a platform that allows us to easily assemble online studies, allowing us to disseminate them to participants across the world.