Connection matrix. The connection matrix shows an interpretation of tract-tracing experimental data. The upper table shows a connection matrix for brain regions in the hypothalamus. The regions use abbreviations from the BAMS nomenclature  and show the strongest connection for which there is some experimental evidence. Double-clicking a cell will issue a query to show the supporting evidence. This evidence is summarized in a table below the matrix. In this view, we show evidence for a connection between the postsubiculm (POST) and the retrospenial (RSP) area. The highlighted experiment involved the injection of a flourescent dye into subregion 'a' of the ventral RSP (RSPv-a). The dye moved in a retrograde manner to label cell bodies in the POST. Note that this involves containment reasoning about brain regions.