the brain is an outcropping of the nervous system.
the nervous system has millions (or billions, I don’t know) of tiny nerves, many of which reach the surface of the skin and some just below.
They all eventually reach the brain, combining in strange ways.
A hug engages millions of nerves simultaneously, an overload.
When it reaches the hippocampus and amygdala, which emotional juices come out? The ones that relax or the ones that make us freeze or want to flee or fight?
But how much of each? Is there a way to guarantee the flood of switches being turned on will mostly engage the necessary juices to flood the brain or will they engage the ones one does not want more of?