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Habituation of orienting reaction in night terrors
Abstract:
A polygraphic study on resistance to habituation of the somatic (EMG), autonomic (finger vasoconstriction, galvanic skin reaction, respiration, pulse) and EEG (acoustic-evoked potential, EEG-blocking reaction) components of the orienting reaction elicited by a repetitive auditory stimulus was performed in 36 patients with night terrors and in 72 matched subjects in two control groups. The study evidenced a significantly higher resistance to habituation of the orienting reaction in patients with night terrors than in normal subjects (control group I) but significantly lower than in patients with symptomatic epilepsy (control group II). The severity of these habituation disturbances in patients with night terrors depended on the patients' age, the history of nocturnal events and their clinical form, as well as on the etiology of episodes. The habituation changes found in patients with night terrors may be ascribed to the nervous disorders of functional and/or organic nature which generated also the night terrors episodes.
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