Publication

Time-Frequency Characterization of Resting-State Brain Function Reveals Overlapping Components with Specific Topology and Frequency Content

Dimitri Nestor Alice Van De Ville, Thomas William Arthur Bolton
2019
Conference Papers

Résumé

Even at rest, functional magnetic resonance imaging (fMRI) data displays exquisitely complex temporal dynamics. Here, we deployed a time-frequency analysis to track the modulus of fMRI signals over time, across space (a set of 341 brain areas) and frequency (45 uniformly distributed bins in the 0.01-0.25 Hz range).

Source officielle

https://infoscience.epfl.ch/entities/publication/530ffb1a-43fc-455c-bc1e-1943e9925167

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Dimitri Nestor Alice Van De Ville, Thomas William Arthur Bolton
2019
Conference Papers

Résumé

Source officielle

https://infoscience.epfl.ch/entities/publication/530ffb1a-43fc-455c-bc1e-1943e9925167

À propos de ce résultat

Concepts associés (32)

Time–frequency analysis

In signal processing, time–frequency analysis comprises those techniques that study a signal in both the time and frequency domains simultaneously, using various time–frequency representations. Rather than viewing a 1-dimensional signal (a function, real or complex-valued, whose domain is the real line) and some transform (another function whose domain is the real line, obtained from the original via some transform), time–frequency analysis studies a two-dimensional signal – a function whose domain is the two-dimensional real plane, obtained from the signal via a time–frequency transform.

Time–frequency representation

A time–frequency representation (TFR) is a view of a signal (taken to be a function of time) represented over both time and frequency. Time–frequency analysis means analysis into the time–frequency domain provided by a TFR. This is achieved by using a formulation often called "Time–Frequency Distribution", abbreviated as TFD. TFRs are often complex-valued fields over time and frequency, where the modulus of the field represents either amplitude or "energy density" (the concentration of the root mean square over time and frequency), and the argument of the field represents phase.

Analyse en composantes principales

L'analyse en composantes principales (ACP ou PCA en anglais pour principal component analysis), ou, selon le domaine d'application, transformation de Karhunen–Loève (KLT) ou transformation de Hotelling, est une méthode de la famille de l'analyse des données et plus généralement de la statistique multivariée, qui consiste à transformer des variables liées entre elles (dites « corrélées » en statistique) en nouvelles variables décorrélées les unes des autres. Ces nouvelles variables sont nommées « composantes principales » ou axes principaux.

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