Narayanan AS, Rothenfluh A. I Believe I Can Fly!: Use of Drosophila as a Model Organism in Neuropsychopharmacology Research. Neuropsychopharmacology. 2015 Oct 30. PMID: 26576740.
From the abstract: "... Here, we outline why we study an invertebrate
organism in the context of neuropsychiatric disorders, and we discuss
how we can gain insight from studies in Drosophila. ...
Highlighting some translational examples, we underline the fact that
their brains works more like ours than one would have anticipated."
Their Fig. 1 provides a nice graphical summary of translational approaches.