What we can infer from the gradual evolution of various species on Earth is that brains do seem to evolve larger, more complex, more efficient - though are ofte

What we can infer from the gradual evolution of various species on Earth is that brains do seem to evolve larger, more complex, more efficient - though are often bottlenecked by other costs. If you look at a snapshot of all life on Earth over tens of millions of years, the average brain size of dominant species has clearly increased.