That is an interesting example, and I think it may well be germane.
But the other point is that Egnor is simply wrong. Intellectual seizures do occur. Here, for example, is a woman with frontal lobe epilepsy whose seizures consisted of the thought "“I have something that I must do”
There are other such examples.
I think Egnor’s argument errs in failing to appreciate the neurological complexity involved in complex abstract thoughts. Similar to his other arguments, he seems to believe that there is a single point in the brain that, when stimulated, should cause someone to understand the Pythagorean theorem or make an argument in favour of a flat tax rate. By the same token, you don’t just stimulate a tiny point in the brain and cause someone to brush his teeth.