It is likely that a similar distribution is present in humans, a situation supported by the observation of a normalization of functional magnetic resonance imaging (fMRI) in various brain regions, in particular those associated with the dopaminergic reward circuitry, by a mixed 5-HT1A/TAAR1 compound in patients with schizophrenia (Nazimek et al., 2016). Here, TAAR1 is linked to schizophrenia.