“…Non-motor sequelae are also wide ranging due to more widespread loss of dopamine within the striatum and cortex as well as neurodegenerative changes beyond the dopaminergic system (Kish et al, 1988;Miguelez et al, 2020). Cognitive symptoms can be apparent even in the early stages of the condition (e.g., Levin et al, 1991;Lewis et al, 1998;Owen et al, 1997;Todorova et al, 2014;Wright, Burns et al, 1990) and there is increasing interest in social, emotional and communicative impairments, as these can have a significant impact on patient quality of life (Coundouris et al, 2019;Henry et al, 2015;Pohl et al, 2017;Prenger et al, 2020;Schrag et al, 2000). A better understanding of these aspects of PD may contribute towards improved therapies and support for communication difficulties in the future (Holtgraves, 2016).…”