Essentially, this is what your brain thinks you look like.
A cortical homunculus is a visualization of the primary motor cortex and primary somatosensory cortex. The size of a body region on the model is based on the amount of cortex dedicated to that site, sometimes giving absurd-looking results.
This particular example represents the motor cortex. Given the dexterity of our hands and our mouths (for eating and speaking), it is no surprise that so much brain power is given to those areas.
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