Refer Madness spotlights strange, intriguing, or otherwise noteworthy questions I encounter at the library reference desk.

Here’s an interesting one that came to the desk: the PseudoBulbar Affect. (Pseudo “false” + Bulbar, referring to the brainstem.)

A patron said she had it and was looking for some scholarly information about it. According to PBAinfo.org, PBA occurs when “certain neurologic diseases or brain injuries damage the areas in the brain that control normal expression of emotion. This damage can disrupt brain signaling, causing a ‘short circuit’ and triggering involuntary episodes of crying or laughing.”

These outbursts can be inappropriate (spontaneous crying or laughing when neither are warranted) and exaggerated (more intense or larger than the situation merits). Common causes include traumatic brain injury, Alzheimer’s or dementia, stroke, multiple sclerosis, Parkinson’s, and Lou Gehrig’s disease.

The first reference to PBA is credited to the Charles Darwin, in his 1872 book The Expression of the Emotions in Man and Animals, and it’s in the kind of language that sounds crass now to our more medically enlightened ears: “We must not, however, lay too much stress on the copious shedding of tears by the insane, as being due to the lack of all restraint; for certain brain-diseases, as hemiplegia, brain-wasting, and senile decay, have a special tendency to induce weeping.”

The more you know.