How does it work?
RefViz processes each dataset with an unbiased review of all terms found in the title and abstract/notes fields. It essentially groups the literature the same way you would stack papers. Two visualizations are provided to review the literature: the galaxy and the matrix.
 

The Galaxy view shows the results of searching for a term throughout the dataset.

The Matrix view
RefViz highlights associations between terms by presenting a review of which subjects tend to be discussed together in the literature (terms vs. terms), or an overview of the major concepts discussed across groups (terms vs. groups).

Red cells at the intersection of the columns and rows indicate the corresponding terms are often discussed together in the reference set.
Blue cells indicate few references contain both terms.
White cells indicate no significant association in either direction.