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Entropy 2015, 17(8), 5241-5256;

Neural Network Reorganization Analysis During an Auditory Oddball Task in Schizophrenia Using Wavelet Entropy

Biomedical Engineering Group, Universidad de Valladolid, Paseo Belén 15, 47011 Valladolid, Spain
IMUVA, Instituto de Investigación en Matemáticas, Universidad de Valladolid, Plaza de la Universidad, 1a, 47002 Valladolid, Spain
INCYL, Instituto de Neurociencias de Castilla y León, Universidad de Salamanca, Patio de las Escuelas 1, 37008 Salamanca, Spain
Facultad de Medicina, Universidad de Valladolid, Avenida Ramón y Cajal 7, 47007 Valladolid, Spain
Author to whom correspondence should be addressed.
Academic Editor: Raúl Alcaraz Martínez
Received: 27 May 2015 / Revised: 11 July 2015 / Accepted: 20 July 2015 / Published: 27 July 2015
(This article belongs to the Special Issue Wavelet Entropy: Computation and Applications)
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The aim of the present study was to characterize the neural network reorganization during a cognitive task in schizophrenia (SCH) by means of wavelet entropy (WE). Previous studies suggest that the cognitive impairment in patients with SCH could be related to the disrupted integrative functions of neural circuits. Nevertheless, further characterization of this effect is needed, especially in the time-frequency domain. This characterization is sensitive to fast neuronal dynamics and their synchronization that may be an important component of distributed neuronal interactions; especially in light of the disconnection hypothesis for SCH and its electrophysiological correlates. In this work, the irregularity dynamics elicited by an auditory oddball paradigm were analyzed through synchronized-averaging (SA) and single-trial (ST) analyses. They provide complementary information on the spatial patterns involved in the neural network reorganization. Our results from 20 healthy controls and 20 SCH patients showed a WE decrease from baseline to response both in controls and SCH subjects. These changes were significantly more pronounced for healthy controls after ST analysis, mainly in central and frontopolar areas. On the other hand, SA analysis showed more widespread spatial differences than ST results. These findings suggest that the activation response is weakly phase-locked to stimulus onset in SCH and related to the default mode and salience networks. Furthermore, the less pronounced changes in WE from baseline to response for SCH patients suggest an impaired ability to reorganize neural dynamics during an oddball task. View Full-Text
Keywords: wavelet entropy; schizophrenia; neural reorganization; physiological signal processing; neuroscience wavelet entropy; schizophrenia; neural reorganization; physiological signal processing; neuroscience

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Gomez-Pilar, J.; Poza, J.; Bachiller, A.; Gómez, C.; Molina, V.; Hornero, R. Neural Network Reorganization Analysis During an Auditory Oddball Task in Schizophrenia Using Wavelet Entropy. Entropy 2015, 17, 5241-5256.

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