Reductions in expression, motivation and sociability are observed across the spectrum of functional psychoses (Lyne et al., 2012). These features consistently coalesce in factor analytic studies (Blanchard & Cohen, 2006) and are collectively referred to as negative symptoms. Negative symptoms are a significant predictor of poor recovery from first-episode psychosis (Austin et al., 2013; Hodgekins et al., 2015; Singh et al., 2000) and are a treatment priority for many service-users (Sterk, Winter van Rossum, Muis, & de Haan, 2013). However, the development of effective treatment options for negative symptoms is hindered by still limited understanding of their underlying mechanisms (Velthorst et al., 2015).