“What is highly arousing for most people causes an HSP to become very frazzled indeed, until they reach a shutdown point called “transmarginal inhibition.” Transmarginal inhibition was first discussed around the turn of the century by the Russian physiologist Ivan Pavlov, who was convinced that the most basic inherited difference among people was how soon they reach this shutdown point and that the quick-to-shut-down have a fundamentally different type of nervous system.”
