Welcome to brain is not a computer
I am Memming, I'm Kathleen, and we're here to demystify the brain.
How do the human body and the modern computer
relay messages between different components?
In the body the brain uses the spinal cord to talk to remote body parts
and the computer uses buses to communicate with peripheral devices
though the spinal cord and the bus both serve as information highways,
the spinal cord is not a bus
a computer bus is a pathway
which transmits information from one computer component to another
For example, a bus enables the CPU, the brain of the computer, to communicate with the memory.
Other buses such as the USB which stands for Universal Serial Bus
enable communication with input/output devices such as a keyboard, a mouse, or even a robotic arm
Each message sent through a bus is sent as zeros and ones
while some bits of the message contain the source and destination addresses,
other bits encode the data to be transmitted.
Does the human body work the same way?
The spinal cord transmits information between the brain and the rest of the body.
Is it a bus?
The spinal cord is actually a bundle of nerve fibers
with cell bodies located in the center, the gray matter,
and axons located in the surrounding white matter.
Information moves along many different tracks in the spinal cord.
Some tracks called ascending tracts carry sensory information like
touch and pain from the body up to the brain.
Other tracks called descending tracts
deliver motor commands from the brain down to the rest of the body.
These tracks include specific communication lines dedicated to
individual destinations in the body.
For example information from their fingers
and your toes are kept separate and travels through different fibers in the
spinal cord to different parts of your sensory cortex.
This differs from modern
computer architecture where a single bus can transmit information to different
destinations specified by different addresses.
For this reason there are only a few wires in a computer bus,
while there are billions of fibers in the spinal cord.
So the brain is like the computer but very different.
THE END
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