# Exploring a connectivity matrix for the selected brain parcellation
Via the <https://github.com/FZJ-INM1-BDA/HBP-connectivity-component>, the interactive atlas viewer allows interactive exploration of a connectivity matrix, that is defined for the currently selected brain parcellation and available from the HBP Knowledge Graph.
As of now, this function is only available for the `JuBrain Cytoarchitectonic Atlas.
Via the <https://github.com/FZJ-INM1-BDA/HBP-connectivity-component>, the interactive atlas viewer allows interactive exploration of a connectivity matrix, that is defined for the currently selected brain parcellation and available from the HBP Knowledge Graph. As of now, this function is only available for the `JuBrain Cytoarchitectonic Atlas.
## Launching the connectivity browser
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- Select `Connectivity` to select one of the available connecitivty matrices. Note that this list will be growing in the near future, to inlude connectivity information from different sources.
- This will load the connectivity browser with the source region for connection strengths set to the initially selected brain region.
## Working with connectivity data
Upon selecting a preview dataset, several aspects of the UI will change:
- the color map of the parcellation will be replaced by a heat map, derived from the magnitutde of connectivity.
- the color map of the parcellation will be replaced by a heat map of the connection strengths to the source region, effectively visualizing the corresponding row of the connectivity matrix:
Clicking on any of the connected region will reveal a region context menu. In addition to the full name of the region, two buttons are present:
By clicking any of the bars, a context menu of the corersponding brain region will be brought up, providing information about the region and allowing to center the 3D view at this region, or select it as the new source region. The latter effectively selects a new row from the connectivity matrix.
- `Navigate` - navigate to the region of interest.
- `Connectivity` - to the region of interest as the source, and explore its connectivity with other parcellation regions.
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### Export
At the bottom of the side panel, `export` buttons can be found. The data can either be exported as a CSV or PNG.
Using the `export` buttons, the connectivity matrix can be exported as a CSV or PNG file.