The Clinical Measurement Ontology (CMO), Measurement Methods Ontology (MMO), and Experimental Condition Ontology (XCO) are currently being developed at the Rat Genome Database. For more information about these vocabularies please see Shimoyama et al. Three ontologies to define phenotype measurement data. Front Genet. 2012;3:87. Epub 2012 May 28 or contact us (http://rgd.mcw.edu/contact/index.shtml).
Any measurable or observable characteristic related to a downward motion of the head which originated, or was undertaken, controlled, or accomplished as a result of an organism's free will or choice.
Synonyms:
exact_synonym:
downward head motion measurement; head dipping measurement; head dips measurement