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Create sDCM tutorial for fMRI #10

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david-hofmann opened this issue Aug 5, 2024 · 3 comments
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Create sDCM tutorial for fMRI #10

david-hofmann opened this issue Aug 5, 2024 · 3 comments

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@david-hofmann
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Create a tutorial for spectral DCM based parameter inference of fMRI signals:

  • simulate a three region system with a OU process as input
  • estimate the CSD by fitting a vector autoregressive model
  • estimate the parameters
  • produce plots that resemble those in papers and SPM12
@david-hofmann
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The balloon model is not a stable model. The underlying linear system is simulated in a stable regime but the balloon model produces runaway dynamics. So far I was able to stabilize it by setting the coupling between neural activity and balloon model to 0.01.
Can we figure out a better solution? Is stability of the model documented somewhere?

@david-hofmann
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david-hofmann commented Sep 17, 2024

Meanwhile the necessary plotting recipes are implemented in Neuroblox/Neuroblox.jl#412. The above issue is still open but plan to circumvent by using the exact same SPM12 parameters for now.

@david-hofmann
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Started PR #21 . Need to create a recipe for cross-spectral densities.

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