Problem is that it is extremely hard to get funding for cross species cognition and comparison of neural circuits across species emphasizing both similarities AND differences. Funding agencies incentivize "model system = human" claims and reviewers often hate on work in different model system.
Nils Kolling
There is little work on NHPs now. Instead almost all the work is on mice. I can understand that this can tell us about human metabolism. But cognition depends on complex neural circuitry. We need to know what cognitive capacities we share with mice and what capacities are unique to primates or us.