“…While there were no relations between severe physical illness and SOC, the authors demonstrated associations between SOC and depression as well as social variables (Mellqvist et al, 2011). The special interest in this group of chronic patients is based on the fact that subjects with PD suffer not only from extra pyramidal motor symptoms, like tremor, bradykinesia, and rigidity, but also from cognitive and psychiatric disturbances including hallucinations, delusions, as well as mood and sleep disturbances (Auff and Kalteis, 2010). The special interest in this group of chronic patients is based on the fact that subjects with PD suffer not only from extra pyramidal motor symptoms, like tremor, bradykinesia, and rigidity, but also from cognitive and psychiatric disturbances including hallucinations, delusions, as well as mood and sleep disturbances (Auff and Kalteis, 2010).…”