why is it important to remain cautious when discussing hemispheric specialization?

You have to be careful not to put too much stock in it. Hemispheric dominance is really more a myth than anything else. Certain areas of the brain are in fact geared more towards different things, but overall, every function your brain performs takes place in multiple regions.
 
If you dont distinguish the work of any hemisphere, you cannot know how your brain works. With no left hemisphere you cant understand of written, spoken or any other language
 
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