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EEG study on affective valence elicited by novel and familiar pictures using ERD/ERS and SVM-RFE

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Abstract

EEG signals have been widely explored in emotional processing analyses, both in time and frequency domains. However, in such studies, habituation phenomenon is barely considered in the discrimination of different emotional responses. In this work, spectral features of the event-related potentials (ERPs) are studied by means of event-related desynchronization/synchronization computation. In order to determine the most relevant ERP features for distinguishing how positive and negative affective valences are processed within the brain, support vector machine-recursive feature elimination is employed. The proposed approach was applied for investigating in which way the familiarity of stimuli affects the affective valence processing as well as which frequency bands and scalp regions are more involved in this process. In a group composed of young adult women, results prove that parietooccipital region and theta band are especially involved in the processing of novelty in emotional stimuli. Furthermore, the proposed method has shown to perform successfully using a moderated number of trials.

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Abbreviations

BCI:

Brain–computer interface

ERPs:

Event-related potentials

ERD/ERS:

Event-related desynchronization/synchronization

ANOVA:

Analysis of variance

SVM-RFE:

Support vector machine-recursive feature elimination

IAPS:

International affective picture system

NNC:

Novel negative condition

NPC:

Novel positive condition

FNC:

Familiar negative condition

FPC:

Familiar positive condition

LR:

Left–right

FP:

Frontal–parietooccipital

LOO:

Leave one out

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Acknowledgments

This work is partially funded by FEDER through the Operational Program Competitiveness Factors—COMPETE and by National Funds through FCT—Foundation for Science and Technology in the context of the project FCOMP-01-0124-FEDER-022682 (FCT reference PEst-C/EEI/UI0127/2011).

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Authors and Affiliations

  1. Department of Experimental Psychology, University of Seville, 41018, Seville, Spain

    A. R. Hidalgo-Muñoz, A. Galvao-Carmona & M. Vázquez-Marrufo

  2. IEETA, University of Aveiro, 3810-193, Aveiro, Portugal

    M. M. López

  3. Department of Education, University of Aveiro, 3810-193, Aveiro, Portugal

    A. T. Pereira & I. M. Santos

  4. IBILI-Institute of Biomedical Research in Light and Image, Faculty of Medicine, University of Coimbra, Coimbra, Portugal

    A. T. Pereira & I. M. Santos

  5. DETI/IEETA, University of Aveiro, 3810-193, Aveiro, Portugal

    A. M. Tomé

Authors
  1. A. R. Hidalgo-Muñoz
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  2. M. M. López
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  3. A. Galvao-Carmona
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  4. A. T. Pereira
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  5. I. M. Santos
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  6. M. Vázquez-Marrufo
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  7. A. M. Tomé
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Correspondence to A. R. Hidalgo-Muñoz.

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Hidalgo-Muñoz, A.R., López, M.M., Galvao-Carmona, A. et al. EEG study on affective valence elicited by novel and familiar pictures using ERD/ERS and SVM-RFE. Med Biol Eng Comput 52, 149–158 (2014). https://doi.org/10.1007/s11517-013-1126-6

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  • DOI: https://doi.org/10.1007/s11517-013-1126-6

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