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Projection signal statistics can be computed for each structure delineated in the reference atlas by combining or unionizing grid voxels with the same 3-D structural label. While the reference atlas is typically annotated at the lowest level of the ontology tree, statistics at upper level structures can be obtained by combining measurements of the hierarchical children to obtain statistics for the parent structure. The unionization process also separates out the left versus right hemisphere contributions as well as the injection versus non-injection components.

Image Added Projection statistics are encapsulated as a ProjectionStructureUnionize object associated with one Structure, either left, right or both Hemispheres and one SectionDataSet. ProjectionStructureUnionize can be downloaded via RMA.

Example:

• Download structure projection signal statistics for one VISp injection experiment exclusive of injection area
• Download injection site statistics for the same experiment

ProjectionStructureUnionize data is used in the web application to display projection summary bar graphs.