Event-related-potential low-resolution brain electromagnetic tomography (ERP-LORETA) suggests decreased energetic resources for cognitive processing in narcolepsy |
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| Authors: | Michael Saletu Peter Anderer Gerda Maria Saletu-Zyhlarz Magdalena Mandl Josef Zeitlhofer Bernd Saletu |
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| Institution: | 1. Department of Neurology, Medical University of Vienna, Währinger Gürtel 18-20, A-1090 Vienna, Austria;2. Department of Psychiatry and Psychotherapy, Medical University of Vienna, Austria;1. INSERM Stem Cell and Brain Research Institute U846, Bron, France;2. Hospices Civils de Lyon, Hopital Neurologique, Centre Mémoire Ressources Recherche, Lyon, France;3. Hospices Civils de Lyon, Hopital Neurologique, Neurologie C, Lyon, France;4. CNRS, Centre de Neurosciences Cognitives, UMR 5229, Bron, France;5. Université Lyon 1, Lyon, France;1. Sleep Center, Chang Gung Memorial Hospital and University, Linkou, Taiwan;2. Child Psychiatry Department, Chang Gung Memorial Hospital and University, Linkou, Taiwan;3. Psychiatry Department, Chang Gung Memorial Hospital and University, Linkou, Taiwan;4. Stanford University Sleep Medicine Division, Stanford, CA, USA;5. Institute of Medical Sciences, Tzu-Chi University, Hualien, Taiwan;6. Division of Mental Health and Addiction Medicine, Institute of Population Health Sciences, National Health Research Institutes, Zhunan, Taiwan;7. Kidney Research Center, Department of Nephrology, Chang Gung Memorial Hospital and University, Linkou, Taiwan;8. Department of Education, National Chia-Yi University, Chiayi, Taiwan;1. Department of Psychology, University of New Orleans, Louisiana, United States;2. Section on Development and Affective Neuroscience, National Institute of Mental Health Intramural Research Program, Maryland, United States;3. Child Development Lab, Department of Human Development and Quantitative Methodology, University of Maryland, Maryland, United States;1. Behavioural Neuroscience Program, Laurentian University, Canada;2. Department of Biology, Laurentian University, Canada;3. Department of Psychology, Laurentian University, Canada;1. Department of Medicine and Neurology, Emory University, Atlanta, GA 30345, USA |
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| Abstract: | OBJECTIVE: Event-related potentials (ERPs) are sensitive measures of both perceptual and cognitive processes. The aim of the present study was to identify brain regions involved in the processes of cognitive dysfunction in narcolepsy by means of ERP tomography. METHODS: In 17 drug-free patients with narcolepsy and 17 controls, ERPs were recorded (auditory odd-ball paradigm). Latencies, amplitudes and LORETA sources were determined for standard (N1 and P2) and target (N2 and P300) ERP components. Psychometry included measures of mental performance, affect and critical flicker fusion frequency (CFF). RESULTS: In the ERPs patients demonstrated delayed cognitive N2 and P300 components and reduced amplitudes in midline regions, while N1 and P2 components did not differ from controls. LORETA suggested reduced P300 sources bilaterally in the precuneus, the anterior and posterior cingulate gyri, the ventrolateral prefrontal cortex and the parahippocampal gyrus. In psychometry, patients demonstrated deteriorated mood, increased trait anxiety, decreased CFF and a trend toward reduced general verbal memory and psychomotor activity. CONCLUSIONS: Narcoleptic patients showed prolonged information processing, as indexed by N2 and P300 latencies and decreased energetic resources for cognitive processing. SIGNIFICANCE: Electrophysiological aberrations in brain areas related to the 'executive attention network' and the 'limbic system' may contribute to a deterioration in mental performance and mood at the behavioral level. |
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| Keywords: | Narcolepsy Event-related potentials LORETA Cognition Attention |
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