Background: Patients with Parkinson's Disease (PD) show non-motor symptoms, such as cognitive impairment, disrupting executive functions, and mood alterations. Two processes currently researched in these areas are the Theory of Mind (ToM) and the decision-making in PD patients. The ToM is the ability to identify mental states (affective or cognitive) in others, and it is a necessary skill for successful communication in social situations. The decision-making process is researched in PD patients due to alterations in dopaminergic pathways involved in cortico-striatal circuits. These pathways have been linked to cognitive functions. Both processes could be altered in PD patients after the deep brain stimulation (DBS) therapy.