Left: Loss of the arm allows nearby sensory regions to ‘take over’ the lack of space
Right: If our body parts were as relatively big as the space devoted to them in terms of cortical area.
Penfield’s homunculus looks super gross, but it shows how sensation coming in from the hands and mouth is the most discriminating touch on our bodies. This makes sense, given that they are the primary tools we use to explore the environment (remember that we use our mouths to inspect new foods, for example, which is crucial to allow us to live!)
Enjoy the podcast!