EEG-fMRI based information theoretic characterization of the human perceptual decision system

Research output: Contribution to journalArticlepeer-review

Colleges, School and Institutes

Abstract

The modern metaphor of the brain is that of a dynamic information processing device. In the current study we investigate how a core cognitive network of the human brain, the perceptual decision system, can be characterized regarding its spatiotemporal representation of task-relevant information. We capitalize on a recently developed information theoretic framework for the analysis of simultaneously acquired electroencephalography (EEG) and functional magnetic resonance imaging data (fMRI) (Ostwald et al. (2010), NeuroImage 49: 498-516). We show how this framework naturally extends from previous validations in the sensory to the cognitive domain and how it enables the economic description of neural spatiotemporal information encoding. Specifically, based on simultaneous EEG-fMRI data features from n = 13 observers performing a visual perceptual decision task, we demonstrate how the information theoretic framework is able to reproduce earlier findings on the neurobiological underpinnings of perceptual decisions from the response signal features' marginal distributions. Furthermore, using the joint EEG-fMRI feature distribution, we provide novel evidence for a highly distributed and dynamic encoding of task-relevant information in the human brain.

Details

Original languageEnglish
Pages (from-to)e33896
JournalPLoS ONE
Volume7
Issue number4
Publication statusPublished - 2012

Keywords

  • Adult, Algorithms, Analysis of Variance, Binomial Distribution, Computer Simulation, Decision Making, Electroencephalography, Female, Humans, Magnetic Resonance Imaging, Male, Models, Neurological, Neuroimaging, Normal Distribution, Occipital Lobe, Parietal Lobe, Perception, Visual Perception, Young Adult