In a general way brain size is equated with intelligence which in turn has it’s effect on adaptability or the ability to deal with a wider range of situations. Usually smaller brains are associated with animals drive primarily by instinctual like fish or reptiles. In fact, the most primitive part of our brain, responsible for our involuntary reflexes is often referred to as our “reptile brain.” This generalization works to a point, but in reality we still poorly understand the higher functions of the brain. Dolphins for example are considered intelligent and have large brains but scientists are not sure how much of that extra brain mass is used for their specialized echo-location. Furthermore, Neanderthals on average actually had bigger brains then modern humans and yet we know that they did not create art in any way we recognize.
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