Functional Movement Disorders (FMDs) are characterized by uncontrollable body movements or postures. Because the disease has no known neurological mechanism, its diagnosis is ambiguous and time-consuming. The lack of a sense of agency over body movements is a salient feature of FMD patients. We developed two behavioral tasks that can quantify people's volition of movement to improve the diagnostic efficiency of FMDs. A new dot-trajectory task measures participants' sensorimotor metacognition, and the Daw two-step decision-making task assesses participants' choice of action-selection strategies. Here, we validated each task in healthy subjects (N = 253) and hypothesized performance contrasts between FMD patients and healthy controls. Patient data will be collected in collaboration with the UCLA Brain Research Institute in the future. By implementing this novel battery of tasks, we hope to improve both diagnosis and our understanding of the underlying pathology of FMDs.