New measures of agency from an adaptive sensorimotor task

Abstract

Self-agency, the sense that one is the author or owner of ones behaviors, is impaired in multiple psychological and neurological disorders, including functional movement disorders, Parkinsons Disease, alien hand syndrome, schizophrenia, and dystonia. Existing assessments of self-agency, many of which focus on agency of movement, can be prohibitively time-consuming and often yield ambiguous results. Here, we introduce a short online motion tracking task that quantifies movement agency through both first-order perceptual and second-order metacognitive judgments. The task assesses the degree to which a participant can distinguish between a motion stimulus whose trajectory is influenced by the participants cursor movements and a motion stimulus whose trajectory is random. We demonstrate the tasks reliability in healthy participants and discuss how its efficiency, reliability, and ease of online implementation make it a promising new tool for both diagnosing and understanding disorders of agency.