Chemosensory perception is specifically impaired in Parkinson's disease

Patients with Parkinson's Disease (PD) exhibit a considerably diminished sense of smell. The olfactory system is intimately connected to the trigeminal system, responsible for the perception of sensations such as freshness, warmth or piquancy in odorants. Usually, olfactory impairment is associated with a similar reduction of trigeminal sensitivity. A recent study suggests that the trigeminal system is not affected in patients with PD. To test...