In PD, cognitive dysfunction - mainly executive dysfunction - is associated with disruption of the cortico-striato-thalamo-corticale circuits by depletion of dopamine. Dysfunction of these circuits seems to disrupt several cognitive networks, which leads to cognitive dysfunction (Baggio et al., 2014). Cognitive training could counteract these disruptions by normalising activity and connectivity, and ultimately lead to a reduction of impairment. Since earlier studies in different patient populations have shown that cognitive training has lasting effects (Petrelli et al., 2015), normalising disruptions underlying cognitive impairment could prevent cognitive deterioration and therefore prevent or delay the development of PD-D.