Hallucinations are things such as an image, sound, or a smell that seems real, but does not really exist. These are usually caused by a mental illness, effects to a drug, or have endured injury. Hallucinations are not limited towards injured or ill people, but healthy people may experience hallucinations as well. Neurobiology is the study of cella of the nervous system and the organization of those cells into functional circuits that process information and mediate behavior. When hallucinations occur, the brain divides into two parts. The topological emphasizes abnormal activity in specific regions and horological emphasizes the change in activity of pathways connecting different regions of the brain. They may also occur because of modifications in the cerebral cavity, the front section, of the brain.
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