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Anonymous
Brain exposure if done correctly is unlikely to cause serious harm provided nothing interferes with the brain. Then whatever happens is the same as whatever would happen to the rest of the body from that object: solid particles, bacteria, virii, physical damage.
9V battery effect depends of the current. If connected to the correct areas with delicate electrodes, if would cause over stimulation of that function, most likely resulting in paralysis of that function. The signals in the nervous system are very low amperage signals that typically have a recovery time, like lifting and pushing a plunger quickly, so a massive dump of signal would just overload and stop the system.
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