Quantifying the time for accurate EEG decoding of single value-based decisions.

Détails

ID Serval
serval:BIB_D13E82EBFDED
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Quantifying the time for accurate EEG decoding of single value-based decisions.
Périodique
Journal of Neuroscience Methods
Auteur(s)
Tzovara A., Chavarriaga R., De Lucia M.
ISSN
1872-678X (Electronic)
ISSN-L
0165-0270
Statut éditorial
Publié
Date de publication
10/2015
Peer-reviewed
Oui
Volume
250
Pages
114-125
Langue
anglais
Notes
Publication types: Journal Article
Publication Status: ppublish
Résumé
BACKGROUND: Recent neuroimaging studies suggest that value-based decision-making may rely on mechanisms of evidence accumulation. However no studies have explicitly investigated the time when single decisions are taken based on such an accumulation process.
NEW METHOD: Here, we outline a novel electroencephalography (EEG) decoding technique which is based on accumulating the probability of appearance of prototypical voltage topographies and can be used for predicting subjects' decisions. We use this approach for studying the time-course of single decisions, during a task where subjects were asked to compare reward vs. loss points for accepting or rejecting offers.
RESULTS: We show that based on this new method, we can accurately decode decisions for the majority of the subjects. The typical time-period for accurate decoding was modulated by task difficulty on a trial-by-trial basis. Typical latencies of when decisions are made were detected at ∼500ms for 'easy' vs. ∼700ms for 'hard' decisions, well before subjects' response (∼340ms). Importantly, this decision time correlated with the drift rates of a diffusion model, evaluated independently at the behavioral level.
COMPARISON WITH EXISTING METHOD(S): We compare the performance of our algorithm with logistic regression and support vector machine and show that we obtain significant results for a higher number of subjects than with these two approaches. We also carry out analyses at the average event-related potential level, for comparison with previous studies on decision-making.
CONCLUSIONS: We present a novel approach for studying the timing of value-based decision-making, by accumulating patterns of topographic EEG activity at single-trial level.
Pubmed
Web of science
Création de la notice
15/02/2015 12:05
Dernière modification de la notice
03/03/2018 21:37
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