im pretty sure its 7%

anyway we only use this amount because the rest is unneeded
i researched this topic for my research speech i had to do...

anyway these are some of the things we could do using more of our brain...

telepathic comunication...speaking without words
psychic type abilities...yup future telling blah
absolute memory...never foget anything which isnt exactly all good
ability to withstand pain...that is unsermountable mounts of pain
strength increases...sometimes when people are in danger and or scared or angry they can display certain amounts of strength uncharacteristic to their usual abilities

there are some more but i cant remember them at the moment