Final answer:
Major or Mild Neurocognitive Disorder due to Parkinson's Disease is mainly characterized by motor impairment, including slowed movements, balance and posture problems, and rigidity. Cognitive issues can occur as the disease progresses, but memory loss is not a defining characteristic initially.
Step-by-step explanation:
Major or Mild Neurocognitive Disorder due to Parkinson's Disease is characterized by motor impairment. This includes slowed movements, balance and posture problems, rigid muscles, speech changes, and psychological symptoms such as dementia. Parkinson's disease is a neurodegenerative condition that leads to the loss of dopamine neurons in the substantia nigra. These neurons are essential for regulating movement, and their degeneration results in the hallmark symptoms of Parkinson's such as tremor, motor rigidity, bradykinesia, and postural instability. As the disease progresses, cognitive decline and dementia can occur, alongside depression and anxiety. However, memory loss, while it can occur in later stages of Parkinson's disease, is not one of the defining motor symptoms, differentiating it from other neurocognitive disorders that prominently feature memory disturbances as primary symptoms.