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state of apprehension and autonomic nervous system activation resulting from exposure to a nonspecific or unknown cause
a ritualized behavior or mental act that a patient is driven to perform in response to his or her obsessions
drugs that depress multiple aspects of central nervous system function and can be used for sleep, seizures, and general anesthesia
a recurrent, persistent thought, impulse, or mental image that is unwanted and distressing, and comes involuntarily to mind despite attempts to ignore or suppress it
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