The difficulty with movement initiation, or akinesia, is a cardinal debilitating symptom of Parkinson’s disease (PD). It is hypothesised that Parkinsonian akinesia is caused by impaired neuronal function in different brain areas that operate as a behavioural arrest control system, inside and outside the basal ganglia (Klemm, 2001). The activity of this system is modulated by different neurotransmitters and the pathology of PD has shown, for many