Progress and Prospects in Parkinson's Research/Symptoms/Amimia

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Amimia
Fixed and vacant expression (masking)

Very little research has been carried out on this common PD symptom but the following are relevant :-

Allen (1931)  The Dissociation of voluntary and emotional movements of the face with special reference to emotional paresis as a physical sign 

Hemmesch et al (2009)''The Influence of Facial Masking and Sex on Older Adults’ Impressions of Individuals with Parkinson’s Disease. ''

Clark et al (2011) Visual Exploration of Emotional Facial Expressions in Parkinson's Disease 

Tickle-Degnen et al (2011)  Culture, Gender and Health Care Stigma: Practitioners’ Response to Facial Masking Experienced by People with Parkinson’s Disease <