Several free web applications are available already to support examination and visualisation of cognitive concepts in the literature (PubGraph, PubAtlas, PubBrain) and to aid collaborative development of cognitive ontologies (Phenowiki and the Cognitive Atlas).
http://www.ncbi.nlm.nih.gov/pubmed?term=pubbrain
If the nodes have queries X and Y, the top number is the number of hits for(X AND Y), and the bottom number is the number of hits for (X OR Y). The ratio of these numbers is called theJaccard co-occurrence index; it measures the degree to which the two queries coincide among all publications.
http://www.pubatlas.org/
Consortium for Neuropsychiatric Phenomics
http://phenomics.ucla.edu/projects.asp#wording
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