language and tools in chimps

I was surprised by the article about the chimps out performing infants in tests to get treats out of tubes by either spitting or urinating. In class discussion one of the things we did not discuss were motivating indicators or reward type behavior. Possibly in animal brains this Pavlov's rule is more available in terms of classical conditioning than in humans. Potentially the reward/tool/experient was set to cater to an animalistic mind, rather than a human's mind. If the kids had been hungry and the tube was full of breast milk, they may have acted differently...whereas, the monkey mind (sorry chimps) is influenced entirely by smell, and doens't have other distractions or ends to means in terms of getting what they need. They are more likely to take matters into their own hands (literally) to reward themselves which results in being more innovative. This could also be a part of the brain that is more dominant. Maybe the hypothalmus? Maybe the pleasure lobes? Maybe the limbic system?