Cognition and olfaction in Parkinson’s disease

ARTICLESir, We read with interest the recent paper in Brain by Bohnen et al . (2010), which suggested correlation between cognitive function and olfactory loss in Parkinson’s disease (Bohnen et al ., 2010). They found that among 58 patients with Parkinson’s disease, those with poor episodic verbal memory had more impaired olfaction, as tested by the University of Pennsylvania Smell Identification Test (UPSIT). Additionally, there was borderline correlation between olfaction and non-verbal memory and Mini-Mental State Examination. We are conducting an ongoing study of non-motor manifestations of Parkinson’s disease, which includes a full neuropsychological examination and olfactory …