There is one more important point in the article which bears mentioning:
"In chronic pain syndromes, nerves constantly send increased pain signals to the brain. But in IBS, the brain itself seems to be amplifying pain signals it receives from the bowel."
Which seems to say that the brain by itself is responsible for increased pain beyond pain signals transmitted from the gut to the brain via the gut/brain interface.
Cheers.
-------------------- ibs-d (pseudo)with pain and bloating