EPFL Blue Brain Project - A Swiss Brain Initiative’s Post

We’re delighted to share that our general atlas-based open model of the Somatosensory Cortex is out in three eLife Sciences Publications, Ltd. papers! Comprising eight somatosensory cortex subregions with 4.2 million morphological and electrically-detailed neurons, and 14.2 billion synapses, it also includes local, mid-range, and extrinsic connectivity. We used it to study emergent network-level plasticity, spike sorting, intra- and inter-area coding, EEG/LFP and as well as structure-function relationships. Its atlas-based geometry, and anatomical and physiological detail set the stage for community-driven refinement and validation with any new atlas-based data! Any prediction the model makes also has a precise correspondence in real animals where it can be tested in real life. Using calcium-based plasticity rules (see Giuseppe Chindemi’s work), we explored how dendrites, synapse clustering and realistic connectivity combine under in vivo-like conditions. Learning was stable and successfully predicted more changes for synapses embedded in high-dimensional connectivity motifs. The finding about motifs extends previous work by predicting an additional non-local effect: Plasticity of one connection is determined by all other connections between surrounding neurons! We describe how and prove its presence in electron microscopy data. Interested in cortical anatomy? Go to https://lnkd.in/eCpZG2Xv to discover 6 mm of rat cortex, combining both local and long-range connectivity, improved by electron microscopy data, exploring how brain shape affects connectivity. Curious how anatomy & physiology interact? https://lnkd.in/eh3mnugg shows calibration and validation of multi-scale physiology, interareal communication, implications of inhibitory targeting rules as well as optogenetic/lesion studies of rate/synchrony/contrast tuning and inter-laminar processing. We’d love for you to use the model too. The complete 4.2 million neuron model and all the necessary tools to deal with such a large model are openly available. As is a smaller 210K-neuron model with improved connectivity based on EM-derived inhibitory targeting. Want to know what the model is useful for? Check out the plasticity paper or any other publication using the model: LFP, EEG, assembly formation, structure-function and the video showing the impact of connectome complexity on activity. Everything is available here 👉 https://lnkd.in/eQ6jaRjZ Let us know your feedback!

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Michael Reimann

Neuroscience | Modeling and Simulation | Big Data Analysis

2mo

Go check it out. We worked hard on this.

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