sources

Definition

The origins of an observed signal. In brain imaging, sensors outside the head record a mixture, and estimating which locations inside produced it — source localisation — is an ill-posed inverse problem, so any solution rests on strong assumptions. Do not confuse this sense with the everyday one of sources as references or data provenance; both occur in the same papers.

Explainers using this term

• Paper Walkthrough: Interpretable MEG Decoding of Perceived Speech — Reading the Decoder's Weights as a Brain MapInterpretable MEG Decoding of Perceived Speech: Cortical Sources and the Stimulus Features That Drive Retrieval