This could look at the mind, both material and immaterial, and outside influences on it.

There's also the idea of labelling, particularly people with mental illness + stigmas, but lobes of the brain too. (ie the creative right side, and the logical left side.)

Morality, phycology, manipulation, subliminally, like in advertising and government enforced, (if anyones read a clockwork orange, this might make more sense), free will.

Mental health, hospitals, treatments, crime, The unconsious mind, the collective unconsious, theories, thoughts (electricity), semiotics (colour theory i.e red +=power,) symbology, memory, identity.

-There's also the brain itself, a unique organ, which cannot be transplanted, and is the most complex entity in the known universe (a brainy science guy told me this, and i believe him)

we could look at trying to explain it, but also look at what we have done to it, ourselves and to each other, like physically through surgery and mind altering drugs (legal and illegal - inc. presciption drugs but also our obsession with painkillers and numbing / trying to cure everything) and whether these are good or bad things, but also unavoidable alterations such as the way we are with each other, upbringing, illness, mental and physical. nature vs. nurture.

 Theres the bloody gory side to the brain, and the clinical scientific side, with lots of science/ math imagery potential, and head imagery, which can symbolise stuff and maby altering these perceptions. Oh and theres the eyes, which are like windows to the mind maby.

ok this is a lot of badly written rambling, hope the idea comes across, it's just such a vast topic I think. It'd be a lot of thinking outside the box maby, plus I think brains are cool right now :)