Deficits of entropy modulation of the EEG: A biomarker for altered function in schizophrenia and bipolar disorder?
| Autor: | Pablo Núñez, Pedro Holgado-Madera, Jessica Fernández-Sevillano, Javier Gomez-Pilar, María Recio-Barbero, Oscar Martín-Santiago, Alba Lubeiro, Rodrigo de Luis Garcia, Vicente Molina, Mahmoud Karim Haidar, Rafael Segarra-Echeverría, Javier Sanz-Fuentenebro, María Iglesias-Tejedor |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Adult
Male 010407 polymers medicine.medical_specialty Bipolar Disorder Entropy Electroencephalography Audiology 01 natural sciences 03 medical and health sciences Young Adult 0302 clinical medicine Neural ensemble Task Performance and Analysis medicine Humans Pharmacology (medical) Bipolar disorder Cortical Synchronization Biological Psychiatry First episode medicine.diagnostic_test business.industry Cognition Middle Aged medicine.disease Event-Related Potentials P300 0104 chemical sciences Taking medication Psychiatry and Mental health Cross-Sectional Studies Diffusion Tensor Imaging Schizophrenia Female Verbal memory Nerve Net business 030217 neurology & neurosurgery Biomarkers Diffusion MRI Research Paper Antipsychotic Agents |
| Zdroj: | J Psychiatry Neurosci |
| Popis: | Background: The synchronized activity of distributed neural assemblies — reflected in the electroencephalogram (EEG) — underpins mental function. In schizophrenia, modulation deficits of EEG spectral content during a P300 task have been replicated. The effects of treatment, chronicity and specificity in these deficits and their possible relationship with anatomic connectivity remain to be explored. Methods: We assessed spectral entropy modulation of the EEG during a P300 task in 79 patients with schizophrenia (of those, 31 were in their first episode), 29 patients with bipolar disorder and 48 healthy controls. Spectral entropy values summarize EEG characteristics by quantifying the irregularity of spectral content. In a subsample, we calculated the network architecture of structural connectivity using diffusion tensor imaging and graph-theory parameters. Results: We found significant spectral entropy modulation deficits with task performance in patients with chronic or first-episode schizophrenia and in patients with bipolar disorder, without significant pre-stimulus spectral entropy differences. The deficits were unrelated to treatment doses, and spectral entropy modulation did not differ between patients taking or not taking antipsychotics, lithium, benzodiazepines or antidepressants. Structural connectivity values were unrelated to spectral entropy modulation. In patients with schizophrenia, spectral entropy modulation was inversely related to negative symptoms and directly related to verbal memory. Limitations: All patients were taking medication. Patients with bipolar disorder were euthymic and chronic. The cross-sectional nature of this study prevented a more thorough analysis of state versus trait criteria for spectral entropy changes. Conclusion: Spectral entropy modulation with task performance is decreased in patients with schizophrenia and bipolar disorder. This deficit was not an effect of psychopharmacological treatment or structural connectivity and might reflect a deficit in the synchron ization of the neural assemblies that underlie cognitive activity. |
| Databáze: | OpenAIRE |
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