Studies using functional magnetic resonance imaging (fMRI) have shown that scratching causes patterns of brain activity that are associated with pleasure and reward. This effect is strongest when you do the scratching yourself and when you are actually scratching an itch, rather than just an arbitrary patch of skin. But contrary to what you might expect, or might have read elsewhere, there’s no clear evidence that this pleasure comes from a release of endorphins – it happens purely in your brain and spine. This mechanism may have evolved to encourage us to dislodge skin parasites. All the evidence suggests that it’s a very ancient response, because all vertebrates scratch themselves – even fish!
สมัครสมาชิก:
ส่งความคิดเห็น (Atom)
GIRL COMIC banner small 4
ขายการ์ตูนออนไลน์ การ์ตูนตาหวาน การ์ตูนผู้หญิง การ์ตูนสยองขวัญ การ์ตูน Princess หมึกจีน แบบ pdf ดูในคอมพิวเตอร์หรือแท็บเล็ต ดูรายชื่อการ์ต...
-
1. red dwarf They smoked us a kipper and they’re back for breakfast! Having successfully negotiated a couple of lengthy hiatuses and t...
-
Military case - The Baltic Submariners During years of the World War II, submarines were fighting in all seas and oceans. the Baltic Sea was...
-
1. Holodecks help ready soldiers for war Long gone are the days of training videos. Today’s technology is allowing for a much more hands-on...




































ไม่มีความคิดเห็น:
แสดงความคิดเห็น