What is a challenge in brain damage research on brain regions like Wernicke's and Broca's areas?
a) These areas are easily studied and the damage in these areas can be identified.
b) No invasive techniques are used because researchers have a good understanding of the topic.
c) Brain damage is rarely perfectly localized, so it can be difficult to identify if other brain areas are also causing issues.
d) Damage in these regions is isolated, and researchers know that other brain areas are not affected.