PFC deficits have also been observed in a number of other neuropsychiatric disorders (e.g. schizophrenia, bipolar disorder, Posttraumatic Stress Disorder, Anxiety disorders, Tourettes Syndrome), in normal aging, in neurodegenerative disorders such as Alzheimer's and Parkinson's Disease, and following traumatic brain injury to the PFC.The PFC subserves working memory.