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Now, a neurochemical cascade. Let's talk about how the brain works.
When it signals something from a stimulation, when it receives that stimulation
of any kind it sends out a message. And that message is
traveling through a neuron. Next, the messenger arrives
at the end of the neuron and is confronted with a gap. And that gap
is called a "synapse gap." At the gap, at the synapse,
a messenger is expressed, sort of like a Pony Express rider
that takes the message from one neuron, to the next,
to the next, to the next, until you've completed that train of thought.
Remember that the actual messenger
is one of a family of brain chemicals called "neurotransmitters."
Now these were discovered less than a hundred years ago.
And with improvements in research tools, brain chemicals are still today
being discovered and will be discovered for the rest of your life.