**7.4 Medial Forebrain Bundle (MFB) stimulation**

A bipolar electrode was implanted in the medial forebrain bundle (MFB) containing the DA ascending fibers (coordinates: A:5; L:1.3; Ht:2). Every 4 minutes, the MFB was stimulated for 20 seconds by 20 bursts (one per second) of 25 positive square pulses, each lasting 0.5 ms, with a 2 ms interpulse interval (40 Hz theoretical frequency). Each burst was triggered 300 ms after the measurement of DPA (Dentresangle et al., 2001; Dzahini et al., 2010).
