Do you have a patient who gets around 20 TIAs a day? Chances are, those are not TIAs (if they were, he would have been dead by now from a massive stroke). They are probably seizure phenomena and an EEG will go a long way to making a diagnosis in these patients. The differential includes focal intracranial arterial stenosis which can present in a similar fashion and can be picked up with a transcranial doppler or a high quality MR Angiogram or a conventional angiogram.