Master the 2026 Movement Disorders Challenge – Unleash Your Neurological Superpowers!

The main idea here is to distinguish motor versus non-motor features of Parkinson disease and recognize a common non-motor symptom. Loss of smell is a non-motor symptom and it is frequently seen in people with PD. Olfactory dysfunction often appears early in the disease and can precede the classic movement problems by years, reflecting early pathology in olfactory pathways. In contrast, the listed motor signs—tremor, rigidity, and bradykinesia—stem from dysfunction in motor circuits like the nigrostriatal pathway and are not non-motor features. So loss of smell best fits as a non-motor feature commonly observed in Parkinson disease.