Recent research suggests that our sense of smell evolved to help us find our way. Now, McGill University neuroscientist Louisa Dahmani and her colleagues support that idea, termed the "olfactory spatial hypothesis." From Science News:
Scientists linked both skills to certain spots in the brain: The left orbitofrontal cortex and the right hippocampus were both bigger in the better smellers and better navigators. The left orbitofrontal cortex and the right hippocampus were both bigger in the better smellers and better navigators. While the orbitofrontal cortex has been tied to smelling, the hippocampus is known to be involved in both smelling and navigation. A separate group of 9 people who had damaged orbitofrontal cortices had more trouble with navigation and smell identification...
"An intrinsic association between olfactory identification and spatial memory in humans" (Nature Communications)
