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- Karl J. Friston, JÃ©rÃ©mie Mattout, Nelson J. Trujillo-Barreto, John Ashburner, W. J. Penny
- NeuroImage
- 2007

This note derives the variational free energy under the Laplace approximation, with a focus on accounting for additional model complexity induced by increasing the number of model parameters. This isâ€¦ (More)

- Karl J. Friston, Lee M. Harrison, +6 authors JÃ©rÃ©mie Mattout
- NeuroImage
- 2008

This paper describes an application of hierarchical or empirical Bayes to the distributed source reconstruction problem in electro- and magnetoencephalography (EEG and MEG). The key contribution isâ€¦ (More)

- William D. Penny, Nelson J. Trujillo-Barreto, Karl J. Friston
- NeuroImage
- 2005

We describe a Bayesian estimation and inference procedure for fMRI time series based on the use of General Linear Models (GLMs). Importantly, we use a spatial prior on regression coefficients whichâ€¦ (More)

- Jorge Bosch-Bayard, Pedro A. Valdes-Sosa, +5 authors Nelson J. Trujillo-Barreto
- Clinical EEG
- 2001

This article describes a new method for 3D QEEG tomography in the frequency domain. A variant of Statistical Parametric Mapping is presented for source log spectra. Sources are estimated by means ofâ€¦ (More)

- Nelson J. Trujillo-Barreto, Eduardo Aubert-VÃ¡zquez, Pedro A. Valdes-Sosa
- NeuroImage
- 2004

In this paper, the Bayesian Theory is used to formulate the Inverse Problem (IP) of the EEG/MEG. This formulation offers a comparison framework for the wide range of inverse methods available andâ€¦ (More)

- Karl J. Friston, Nelson J. Trujillo-Barreto, Jean Daunizeau
- NeuroImage
- 2008

This paper presents a variational treatment of dynamic models that furnishes time-dependent conditional densities on the path or trajectory of a system's states and the time-independent densities ofâ€¦ (More)

- Roberto C. Sotero, Nelson J. Trujillo-Barreto, Yasser Iturria-Medina, Felix Carbonell, Juan C. JimÃ©nez
- Neural Computation
- 2007

We study the generation of EEG rhythms by means of realistically coupled neural mass models. Previous neural mass models were used to model cortical voxels and the thalamus. Interactions betweenâ€¦ (More)

- W. J. Penny, Guillaume Flandin, Nelson J. Trujillo-Barreto
- Human brain mapping
- 2007

In previous work (Penny et al., [2005]: Neuroimage 24:350-362) we have developed a spatially regularised General Linear Model for the analysis of functional magnetic resonance imaging data thatâ€¦ (More)

The increase of induced gamma-band responses (iGBRs; oscillations >30 Hz) elicited by familiar (meaningful) objects is well established in electroencephalogram (EEG) research. This frequency-specificâ€¦ (More)

- Sabine Grimm, Urte Roeber, Nelson J. Trujillo-Barreto, Erich SchrÃ¶ger
- NeuroImage
- 2006

In order to keep track of potentially relevant information in the acoustic environment, the human brain processes sounds to a high extent even when they are not attended: it extracts basic features,â€¦ (More)