The social cost of facial bradykinesia: a scoping review of interpersonal outcomes related to Parkinsonian hypomimia.

Parkinson's disease (PD) is classically defined by its motor manifestations, yet its negative psychosocial impact remains underrecognized. Facial bradykinesia, or hypomimia, restricts patients' primary channel for nonverbal communication, potentially establishing a substantial barrier to social connection and relationship maintenance. This scoping review maps the literature concerning the interpersonal and psychosocial outcomes of hypomimia in adults with PD. Following Joanna Briggs Institute (JBI) methodology and PRISMA-ScR guidelines, we systematically searched PubMed, Europe PMC, Semantic Scholar, and Google Scholar databases. Rigorous screening against predefined eligibility criteria yielded 14 primary studies for thematic data extraction and narrative synthesis. Hypomimia operates as a "dual-blind" communication barrier. Internally, it disrupts the "emotional mirror" mechanism; impaired physical mimicry is associated with a diminished capacity for patients to recognize others' emotions. Externally, the mask frequently elicits character misidentification; observers and even healthcare professionals frequently misjudge patients as apathetic, depressed, or cognitively impaired. Female patients often experience heightened stigmatization due to violated gender norms. Domestically, this can create an "invisible wall," contributing to spousal misinterpretation and negatively impacting caregiver relationship satisfaction. Crucially, perceived stigma serves as a primary clinical mediator of diminished quality of life (QoL) than depression alone. Furthermore, facial masking disrupts the bidirectional relationship between social environments and emotional expression. Hypomimia is a significant contributing factor to psychosocial isolation. Comprehensive PD management must transcend motor-centric therapies to incorporate caregiver education, clinical bias-awareness training, and emotion-recognition rehabilitation.