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Functional Connectome Temporal Scales

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SeminarPast EventNeuroscience

The functional connectome across temporal scales

Sepideh Sadaghiani

Assistant Prof

Assistant Professor, University of Illinois, USA

Schedule
Wednesday, March 30, 2022

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Schedule

Wednesday, March 30, 2022

6:00 AM America/Montreal

Host: McGill Neuro

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Format

Past Seminar

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McGill Neuro

Duration

70.00 minutes

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Abstract

The view of human brain function has drastically shifted over the last decade, owing to the observation that the majority of brain activity is intrinsic rather than driven by external stimuli or cognitive demands. Specifically, all brain regions continuously communicate in spatiotemporally organized patterns that constitute the functional connectome, with consequences for cognition and behavior. In this talk, I will argue that another shift is underway, driven by new insights from synergistic interrogation of the functional connectome using different acquisition methods. The human functional connectome is typically investigated with functional magnetic resonance imaging (fMRI) that relies on the indirect hemodynamic signal, thereby emphasizing very slow connectivity across brain regions. Conversely, more recent methodological advances demonstrate that fast connectivity within the whole-brain connectome can be studied with real-time methods such as electroencephalography (EEG). Our findings show that combining fMRI with scalp or intracranial EEG in humans, especially when recorded concurrently, paints a rich picture of neural communication across the connectome. Specifically, the connectome comprises both fast, oscillation-based connectivity observable with EEG, as well as extremely slow processes best captured by fMRI. While the fast and slow processes share an important degree of spatial organization, these processes unfold in a temporally independent manner. Our observations suggest that fMRI and EEG may be envisaged as capturing distinct aspects of functional connectivity, rather than intermodal measurements of the same phenomenon. Infraslow fluctuation-based and rapid oscillation-based connectivity of various frequency bands constitute multiple dynamic trajectories through a shared state space of discrete connectome configurations. The multitude of flexible trajectories may concurrently enable functional connectivity across multiple independent sets of distributed brain regions.

Topics

EEGbrain activityfMRIfunctional connectomehemodynamic signalintrinsic connectivityneural communicationoscillation-based connectivitytemporal scales

About the Speaker

Sepideh Sadaghiani

Assistant Prof

Assistant Professor, University of Illinois, USA

Contact & Resources

No additional contact information available

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