We are asking up to 620 individuals to participate in this study in several different ways. Specifically, there is an experimental group (ExpG), questionnaire group (QG) and communication partner group (CPG). The ExpG will be composed of individuals with PD and the healthy age and gender matched controls (HC)(Up to 140 total will be asked, 80 expected to complete the study). The QG will include the significant others, family members, and friends of the ExpG (Up to 140 will be asked, 80 expected to complete the study). The CPG will be made up of friends of the ExpG (Up to 340 will be asked, 240 expected to complete the study).Some individuals in the ExpG may not pass the initial screenings. As a result, their QG and CPG will no longer need to participate. Therefore, the actual number of individuals who will complete the study is expected to be much less.