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Homunculus -

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Homunculus

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What would a man's body look like if each part grew in proportion to the area of the brain
concerned with its sensory perception? Or, the area concerned with body movement? Sensory and motor
homunculus (latin for little human) are rather different in proportion to how we actually look.

NARRATION

What has the lips of Mick Jagger, the body of Elijah Wood, the tongue of that guy from Kiss, and
the hands of Michael Jordan?

Give up? It's the homunculus. Although he looks like he should be dancing along the yellow brick
road, or working in a chocolate factory, the homunculus is a visualisation of the relationship
between human body parts and the area of the brain responsible for them.

The homunculus comes in two varieties - sensory and motor. The sensory homunculus shows how much
brain power is dedicated to sensing different body parts. It looks weird because the relative
proportions of the body parts are not about physical size, but the number of related neural
connections in the brain.

The motor homunculus depicts the size of body parts based on the complexity of movements they can
perform. When you think about how complex our hand and facial movements are, you can see why
they're so big on the homunculus.

While in one way, the homunculus is a strange reflection of ourselves, thankfully, it's all in the
mind.