"For me, it was a smell of bananas. When I smelt that, I'd just sit down wherever I was before the blackness came."
– Vusi Mahlasela
The quality of the aura will indicate which particular region of the brain is being abnormally activated. For example, a hallucination of smell is most likely to originate in one of the temporal lobes, whereas involuntary twitching of one hand (not really an aura as it is not a sensation, but having exactly the same significance) will suggest a focus in the opposite frontal lobe.
Epilepsy - Real life story