Which of the following central nervous system conditions is NOT associated with taste alteration?

Huntington's disease is recognized primarily for its effects on movement, cognitive function, and psychiatric health due to the degeneration of neurons in specific areas of the brain. While it can lead to various neurological disturbances, there is no well-established link between Huntington's disease and taste alterations.

In contrast, the other conditions listed have documented associations with alterations in taste perception. For instance, multiple sclerosis can impact sensory pathways in the nervous system, potentially leading to distorted taste; Bell's palsy affects facial features, including the nerves that help convey taste sensations from parts of the tongue; and head trauma can disrupt the central processing of taste signals.

This specificity of Huntington's disease highlights its unique pathophysiology compared to the other conditions, which are more directly linked to altered sensory functions, including taste.