That's false. For example, I've done some work on computational models of the visual cortex. Researchers in this area have in the past made testable predictions

That's false. For example, I've done some work on computational models of the visual cortex. Researchers in this area have in the past made testable predictions about the structure of the visual cortex regarding for example, distributions of synapses, types of neurons and their function, etc. All this done based on computational arguments about time/space complexity, etc. The brain is basically a computing device, it makes perfect sense that it should be analyzed as such.