Final answer:
Deterioration in mental state due to organic brain damage is linked to neurodegenerative disorders like Parkinson's and Alzheimer's diseases, where neuron death leads to loss of nervous system function, characterized by symptoms related to the affected areas of the brain.
Step-by-step explanation:
The deterioration of mental state due to organic brain damage is commonly observed in various neurodegenerative disorders. These disorders involve progressive loss of nervous system function owing to neuron death. For instance, Parkinson's disease is a degenerative brain disorder that results from the death of neurons in the midbrain, causing muscular symptoms such as tremors, rigidity, and slowness of movement. Another example is Alzheimer's disease, where there is a significant neurodegeneration within the ventricles and hippocampus, leading to severe cognitive decline, including memory loss and impaired thinking skills.
Hepatic encephalopathy is another condition that can lead to a reversible neuropsychiatric abnormality due to liver failure. It is characterized by a range of neurological impairments such as confusion and coma. Furthermore, the idea that any damage to the physical brain should not affect the mind, if it is a non-physical entity, is contradicted by the physical changes observed in conditions where the brain is impaired, resulting in altered mental functioning.