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The psychological specialty that investigates the physical and chemical processes that cause and occur as a response to behavior and mental processes (also called physiological psychology, neuro-science, or biological psychology). For example, bio logical psychologists have found that patients experiencing hallucinations, in the form of hearing voices or seeing things, exhibit brain activity in those regions that process auditory and visual information. Research methods include the enhancement of neural functions through electrical stimulation, psychopharmacological manipulation, or transcranial magnetic stimulation or the disablement of certain neural functions via electro lytic, chemical, or other forms of lesions. Neural activity is often measured by functional magnetic resonance imaging (fMRI); electroencephalography (EEG), or the measurement of single neurons; and functional neuro-anatomy. In humans, research often focuses on patients with ...