“…In the postoperative phase, a state of mild euphoria and hyperactivity can frequently be observed, but this is generally transient if medication is reduced in tandem . However, an excessively rapid increase in stimulation parameters can also induce hilarity, hypomania, mania, or impulse-control disorders (Krack et al, 2001;Kulisevsky et al, 2002;Romito et al, 2002;Herzog et al, 2003;Mandat et al, 2006;Ulla et al, 2006Ulla et al, , 2011Mallet et al, 2007;Raucher-Chene et al, 2008;Coenen et al, 2009;Chopra et al, 2011) requiring adaptation of medical treatment and/or stimulation settings. These behavioral changes are usually induced by stimulation with the more ventral and medial contacts (i.e., stimulation of the ventral limbic STN) (Krack et al, 2001;Mallet et al, 2007).…”