Dopamine signalling in the brain is complex, and is key to several emotional, motivational, and cognitive processes.[Laviolette, 2007; Owen et al., 2016; Stahl, 2013] Some of this complexity is simplified on the slide.
References:
Laviolette SR. Dopamine modulation of emotional processing in cortical and subcortical neural circuits: evidence for a final common pathway in schizophrenia? Schizophr Bull 2007; 33 (4): 971–981.
Owen MJ, Sawa A, Mortensen PB. Schizophrenia. Lancet 2016; 388 (10039): 86–97.
Stahl SM. Stahl’s Essential Psychopharmacology. Neuroscientific Basis and Practical Applications. Fourth Edition. © Cambridge University Press, 2013.