The figures show percent time spent in the food port (mean ± SEM) during cue presentation (A,B) or reward delivery (C,D) during conditioning with laser-mediated inhibition of LH GABA terminals in VTA, or during cue presentation in conditioning without laser-mediated inhibition of LH GABA terminal in VTA (E,F). Rats in the NpHR group demonstrated significantly greater learning when LH GABA terminals in VTA were inhibited during conditioning. However, when this inhibition was released these rats ceased learning.