So how exactly does your brain know when you really feel pain? How can it know the difference between the delicate touch of the feather and a needle prick? And, How can that facts reach Your system in time to respond? There's some evidence that this spreading muscle contraction https://beckettrxvlg.wssblogs.com/29811733/the-fact-about-what-are-pain-receptors-that-no-one-is-suggesting