Dear all,
Just stumbled upon this yawning discussion whilst browsing. We recently did a study where we found excessive yawning was a problem for quite a number of PALS, particularly those with a bulbar onset of disease.
Recently I heard something on the radio from an ENT surgeon that gave me an idea: if bulbar patients have spasticity in their pharynx, it may hold open their Eustachian tube and the yawning helps equalise the ear pressure. Just a thought, but it suggests that one could attempt to alter excessive yawning by either numbing the area reversibly or surgically....
Reference: Wicks P (2007) Excessive yawning is common in the bulbar-onset form of ALS, Acta Psychiatrica Scandinavica, (Correspondence) May 24th 2007