From a summary of a 2003 study by Sweedish scientists:
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A closer look at the cells within the brain revealed that exposed animals had "scattered and grouped dark neurons... often shrunken.. with loss of internal cell structures." These altered neurons were seen in all locations, but "especially the cortex, hippocampus and basal ganglia."
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And just as a head's up... the hippocampus is the only area of the brain that is capable of regularly creating new neurons in adults. It's also responsible for memory formation. Mess with that area, you're just asking for trouble.