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Poster Session B: Wednesday, August 13, 1:00 – 4:00 pm, de Brug & E‑Hall

The Causal Structure of Band-limited Dynamics in the Human Cortex

Paul Hege¹, Markus Siegel¹; ¹Eberhard-Karls-Universität Tübingen

Presenter: Paul Hege

Measurements of the synchronous variation of neural activity in different areas of the brain provide fundamental insights into large-scale human brain function. However, research has so far largely focused on instantaneous correlations, providing little information about the causal structure of neural interactions. Here, we addressed this by systematically characterizing temporally directed interactions of band-limited neural activity across the human cortex using source-reconstructed magnetoencephalography (MEG). We found links between the structure of lagged correlations and models of large-scale brain organization, with cross-frequency lagged interactions varying along a tripolar gradient that closely resembles structural and functional MRI gradients. We also identified discrete brain networks with spatially and spectrally specific interaction profiles that were selectively modified during cognitive tasks.

Topic Area: Brain Networks & Neural Dynamics

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