Virtual Lesion Simulator 2D: Understanding Brain Network…

What is a Connectome?

A connectome refers to the complete map of connections between neurons within a nervous system. In this context, it represents a simplified 14-node model of brain connectivity.

Each node in the graph corresponds to a specific region of the brain, and edges represent neural pathways connecting these regions.

The Role of Global Efficiency

Global efficiency is a measure used in network science that quantifies how well information can be transmitted across the entire network. In this simulation, it is computed using the Floyd-Warshall algorithm to find the shortest paths between all pairs of nodes.

When regions are lesioned, the global efficiency decreases, reflecting disruptions in communication pathways and potentially affecting cognitive functions.

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Lesion-Deficit Mapping

Lesion-deficit mapping is a method used in neuropsychology to identify which brain areas are critical for specific cognitive tasks. By ablating regions of the connectome, this simulation allows us to observe how these deficits manifest.

This approach helps researchers understand the functional architecture of the brain and the role of different neural networks in cognitive processes.

Real-World Applications

Understanding the impact of lesions on network efficiency can aid in diagnosing neurological disorders such as Alzheimer's disease, where connectivity disruptions are a hallmark.

This knowledge is also crucial for developing therapeutic strategies and rehabilitation techniques that target specific brain regions to restore cognitive function.

Frequently asked questions

How does the simulation model different cognitive tasks?

The simulation models Attention, Memory, and Language tasks by focusing on specific subnetworks within the connectome. Each task has a distinct set of nodes that are more relevant to its performance.

What is global efficiency in this context?

Global efficiency measures how efficiently information can be transmitted across the entire network, taking into account all possible paths between any two nodes. It is computed using the Floyd-Warshall algorithm to find the shortest paths.

Can I use this simulation for research purposes?

Yes, researchers and students can use this simulation to explore various scenarios of brain network disruption and their effects on cognitive functions, aiding in the development of new theories and hypotheses.

How does the stimulation pulse work in the simulation?

The stimulation pulse propagates through the remaining pathways in the connectome graph. It helps visualize how information flows across the network when certain regions are lesioned, providing insights into network dynamics and connectivity patterns.

Try it live

Everything above runs in your browser — open Virtual Lesion Simulator 2D: Connectome Graph Lesion-Deficit Mapping and change the parameters while it is running. Nothing is installed, nothing is uploaded, the whole model lives in one tab.

▶ Open Virtual Lesion Simulator 2D: Connectome Graph Lesion-Deficit Mapping simulation

Virtual Lesion Simulator 2D: Understanding Brain Network Connectivity