Thus far, three types of spatial neurons have been found in rat brains, all in the hippocampus. In humans, this part of the brain is critical for long-term memory storage as well as spatial orientation. Although the neurons continue to develop after the baby rats move out of their nests, they initially fire well before such exploration begins. This indicates that the ability to orient must be innate.Personally, I take exception to this conclusion. But then again, results from model organisms don't always translate to humans.