Final answer:
Neurocognitive Disorder with Lewy Bodies is characterized by visual hallucinations, fluctuating cognition, and Parkinsonian motor symptoms, caused by Lewy bodies in the brain.
Step-by-step explanation:
The key differentiating features of Neurocognitive Disorder with Lewy Bodies include visual hallucinations, fluctuating cognition, and motor symptoms like those seen in Parkinson's disease. The physical cause of these symptoms is the presence of Lewy bodies in the brain. Lewy bodies are abnormal protein clumps found within dopaminergic neurons, which are often correlated with the severity of the disease. These symptoms reflect the neurodegenerative nature of the disorder, involving the death of nervous system neurons that worsens over time.