However, the means of the search does change the act of searching itself. Using a good metal detector makes it more efficient while denying there is anything to find or using a broken detector makes the search difficult.
Reacting to Parkinson’s (or stammering or depression) is like going metal detecting; you have no control over what you find but you have a choice of how painful or difficult the search will be. Even if you refuse to go the disease will drag you on the search anyway. Therefore, using a good detector makes it less painful and enables you to see more of the disease, which in turn allows you to see more of the space within the disease for you.