Olfactory and Gustatory Function in Early-stage Parkinson’s Disease: Implication for Cognitive Association

Cognitive impairment is a prevalent non-motor symptom of Parkinson's disease (PD), significantly impacting the quality of life, particularly in the later stage.Hyposmia and hypogeusia are also recognized as non-motor symptoms of PD and are often interrelated. 1, 2While hyposmia has been identified as a potential risk factor for dementia in PD, 3 limited research has delved into the association between hyposmia and cognitive function in early-stage PD patients.Moreover, research on the relationship between gustatory function and cognition is largely lacking.Consequently, we conducted a study to investigate the association between olfactory or gustatory function and cognitive function in early-stage PD without dementia.