'Im sorry if this is a little off topic, but there's a lot of talk about reptilian brains not being equivalent to mammalian brains hence why reptiles can't be trained. While I agree that pythons are not trainable, I was always under the impression that this was related to the size of the brain (small vs big), not the type of brain (reptiles vs mammals). I was under the impression that the larger monitors for example are quite trainable, at least in comparison to pythons, is this a misconception?
Bump, sorry, would anyone be able to elaborate on this?
It's not quite so simple. There are several issues with reptillian brains that render them quite poor at learning. First off, you are correct in that it does depend highly on the species. That said, reptiles do share similar problems with their brain structures that would strongly inhibit learning:
- Raw size does matter, but a better measure is what is called Encephalization quotient: The ratio between the mass of the brain and what would be expected in an animal of that size. Reptiles, particularly snakes have extremely poor ratios- that is the mass of the brain is miniscule compared to other animals of similar size. This is not a particularly good measure of intelligence, but it is a rough correlation.
- Second is the lack of folds on the frontal cortex. It's extremely hard to find a good picture of a snake brain, but picture a human brain. See those wrinkles all over it? Snake brains are actually quite smooth. Those folds are actually extremely important in higher level functioning- basically it increases the surface area of the brain, which multiplies the processing power for any given amount of mass by a drastic amount.
- Animals have very similar brain structures in nature. The forebrain refers to the sections of the brain that deals with learning, consciousness, all that good stuff. In humans, this is massive in comparison to the rest of the brain, in cats and dogs the ratio is about 50/50, in snakes the ratio is opposite, the forebrain is dominated by the hindbrain, which regulates breathing, heartbeat and so on.
Edit- actually found a picture that works:
http://homepage.psy.utexas.edu/homepage/class/psy301/pennebaker/images/BrainEvolution.jpg
The bit you're concerned about is labelled Cerebrum. I'm not entirely sure what mammal that is, but it would be very low order- in comparison to that picture a sheep's brain is highly advanced.