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U FIBER

Written by Pam MS, NCSP | Fact checked by Psychology Dictionary staff 

a nerve fiber which loops through the white matter under the cerebral cortex to link one cortical region to another one. U fibers supply the quickest path for cortical conveying of urges; the optional intracortical pathway is made up of extremely thin fibers with slow transmission rates.

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U STATISTIC

Written by Pam MS, NCSP | Fact checked by Psychology Dictionary staff 

noun. the statistic utilized in the mann-whitney uTEST.

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UATION OR TRIGGER

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interpreted to have occurred without warning.

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UCR FEES

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abbreviated form: typical, traditional, and reasonable fees

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ULCER

Written by Pam MS, NCSP | Fact checked by Psychology Dictionary staff 

noun. an erosion of a tissue's exterior, like the digestive tract's mucosal lining.

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ULNAR NERVE

Written by Pam MS, NCSP | Fact checked by Psychology Dictionary staff 

the sensory and motor nerve which innervates the lateral portion of the hand and forearm. Its fibers stem from the eighth cervical and first thoracic spinal roots, and they go through the brachial plexus's medial section.

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ULTIMATE EXPLANATION

Written by Pam MS, NCSP | Fact checked by Psychology Dictionary staff 

a retelling or depiction for a specific behavior with regard to its adaptive value.

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ULTIMATE OPINION TESTIMONY

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opinion testimony by a witness deemed to be an expert which directly informs the court about the issue being argued.

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ULTIVA

Written by Pam MS, NCSP | Fact checked by Psychology Dictionary staff 

noun. a brand name for remifentanil.

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ULTRADIAN RHYTHM

Written by Pam MS, NCSP | Fact checked by Psychology Dictionary staff 

any periodic variance in physiological or psychological operation recurring within a cycle of more than one day, like the female menstrual cycle.

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