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Int J Psychophysiol. 2014 Jul;93(1):62-9. doi: 10.1016/j.ijpsycho.2013.03.004. Epub 2013 Mar 26.

Excitatory versus inhibitory impairments in insomnia patients: an ERP study.

Author information

1
Dept. Pneumology - Sleep Unit, Universitair Ziekenhuis Brussel, Belgium; Vital Signs and Performance, Royal Military Academy, Belgium. Electronic address: Aisha.cortoos@uzbrussel.be.
2
Faculty of Medicine, Vrije Universiteit Brussel, Belgium.
3
Vital Signs and Performance, Royal Military Academy, Belgium; Dept. of Behavioral Sciences, Royal Military Academy, Belgium; Dept. Experimental and Applied Psychology, Vrije Universiteit Brussel, Belgium.
4
Dept. of Behavioral Sciences, Royal Military Academy, Belgium; Dept. Experimental and Applied Psychology, Vrije Universiteit Brussel, Belgium.
5
Dept. Experimental and Applied Psychology, Vrije Universiteit Brussel, Belgium.

Abstract

According to the neurocognitive perspective on insomnia, conditioned arousal results in impairment of information processing, as such interfering with normal sleep processes. In the present study, evening event-related potentials N100 and P200 were evaluated to assess hyperarousal in patients with insomnia and controls. 13 patients (mean age = 40.8) with polysomnographically verified sleep disruptions and 11 good sleepers (mean age = 45.4) were included. An auditory oddball paradigm was administered the evening of the polysomnography. N100 and P200 mean amplitudes and peak latencies at Fz and Cz were analyzed as a measure of respectively general arousability and inhibition of information processing. Patients experiencing insomnia were characterized by decreased P200 amplitudes compared to good sleepers. No significant differences were found for N100 amplitudes and latencies of both ERP waves. These results suggest that this group of patients with objectified insomnia is characterized by an arousal impairment. However, there was no evidence of hyperarousal, considering the normal N100 amplitudes. On the other hand, the inhibition of information processing was distorted. As such, the impairment of de-arousal or de-activation in insomnia is put forward as an additional factor within the arousal model.

KEYWORDS:

Arousal; Event-related potentials; Inhibition; Insomnia; Sleep

PMID:
23541997
DOI:
10.1016/j.ijpsycho.2013.03.004
[Indexed for MEDLINE]

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