RT info:eu-repo/semantics/article
T1 Relation between EEG resting-state power and modulation of P300 task-related activity in theta band in schizophrenia
A1 Iglesias-Tejedor, María
A1 Díez, Álvaro
A1 Llorca-Bofí, Vicent
A1 Núñez, Pablo
A1 Castaño-Díaz, Carolina
A1 Bote, Berta
A1 Segarra, Rafael
A1 Sanz-Fuentenebro, Javier
A1 Molina, Vicente
AB There is some consistency in previous EEG findings that patients with schizophrenia have increased resting-state cortical activity. Furthermore, in previous work, we have provided evidence that there is a deficit in the modulation of bioelectrical activity during the performance of a P300 task in schizophrenia. Our hypothesis here is that a basal hyperactivation would be related with altered ability to change or modulate cortical activity during a cognitive task. However, no study so far, to the best of our knowledge, has studied the association between resting-state activity and task-related modulation. With this aim, we used a dual EEG paradigm (resting state and oddball task for elicitation of the P300 evoked potential) in a sample of patients with schizophrenia (n = 100), which included a subgroup of patients with first episode psychosis (n = 30), as well as a group of healthy controls (n = 93). The study measures were absolute power for resting-state; and spectral entropy (SE) and connectivity strength (CS) for P300-task data, whose modulation had been previously found to be altered in schizophrenia. Following the literature on P300, we focused our study on the theta frequency band. As expected, our results showed an increase in resting state activity and altered task-related modulation. Moreover, we found an inverse relationship between the amount of resting-state activity and modulation of task-related activity. Our results confirm our hypothesis and support the idea that a greater amount of resting theta-band synchrony could hamper the modulation of signal regularity (quantified by SE) and activity density (measured by CS) during the P300 task performance. This association was found in both patients and controls, suggesting the existence of a common mechanism and a possible ceiling effect in schizophrenia patients in relation to a decreased inhibitory function that limits their cortical reactivity to the task
PB Elsevier
SN 0278-5846
YR 2022
FD 2022
LK https://uvadoc.uva.es/handle/10324/66441
UL https://uvadoc.uva.es/handle/10324/66441
LA spa
NO Progress in Neuro-Psychopharmacology and Biological Psychiatry; Volume 116: 110541
DS UVaDOC
RD 24-nov-2024