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Title: Auditory P3a and P3b neural generators in schizophrenia: An adaptive sLORETA P300 localization approach
Authors: Bachiller, Alejandro
Romero, Sergio
Molina, Vicente
Alonso, Joan F.
Mañanas, Miguel A.
Poza Crespo, Jesús
Hornero Sánchez, Roberto
Issue Date: 2015
Publisher: Elsevier
Description: Producción Científica
Citation: Schizophrenia Research, 2015, vol. 169, p. 318–325
Abstract: The present study investigates the neural substrates underlying cognitive processing in schizophrenia (Sz) patients. To this end, an auditory 3-stimulus oddball paradigm was used to identify P3a and P3b components, elicited by rare-distractor and rare-target tones, respectively. Event-related potentials (ERP) were recorded from 31 Sz patients and 38 healthy controls. The P3a and P3b brain-source generators were identified by timeaveraging of low-resolution brain electromagnetic tomography (LORETA) current density images. In contrast with the commonly used fixed window of interest (WOI), we proposed to apply an adaptive WOI, which takes into account subjects' P300 latency variability. Our results showed different P3a and P3b source activation patterns in both groups. P3b sources included frontal, parietal and limbic lobes,whereas P3a response generators were localized over bilateral frontal and superior temporal regions. These areas have been related to the discrimination of auditory stimulus and to the inhibition (P3a) or the initiation (P3b) of motor response in a cognitive task. In addition, differences in source localization between Sz and control groups were observed. Sz patients showed lower P3b source activity in bilateral frontal structures and the cingulate. P3a generators were less widespread for Sz patients than for controls in right superior, medial and middle frontal gyrus. Our findings suggest that target and distractor processing involves distinct attentional subsystems, both being altered in Sz. Hence, the study of neuroelectric brain information can provide further insights to understand cognitive processes and underlying mechanisms in Sz.
Keywords: Schizophrenia
ISSN: 0920-9964
Peer Review: SI
DOI: 10.1016/j.schres.2015.09.028
Sponsor: Ministerio de Economía y Competitividad (projects TEC2014-53196-R, DPI2011-22680 and DPI2014-59049-R),
Junta de Castilla y León (VA059U13)
Instituto de Salud Carlos III’, ISCIII (FIS PI1102303)
Gerencia Regional de Salud de Castilla y León (GRS 613/A/11; GRS 932/A/14)
Publisher Version:
Language: eng
Rights: info:eu-repo/semantics/openAccess
Appears in Collections:DEP71 - Artículos de revista

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