Subcortical brain structures (caudate, putamen, thalamus, globus pallidus, nucleus accumbens, amygdala, and hippocampus) mapped on a human brain. This image of the subcortical brain structures is from Figure 1 in E. Jung, et al. (2014), Subcortical Correlates of Individual Differences in Aptitude. PLoS ONE 9: e89425. https://doi.org/10.1371/journal.pone.0089425.
Read about changes in the connection between the hippocampus and nucleus accumbens in depression:N. R. Gough, Giving Mice Artificial Memories to Discover Clues to Depression. BioSerendipity (3 December 2018) https://www.bioserendipity.com/clues-to-depression/