measurement of voluntary locomotion into, out of, or within a discrete space in an open field apparatus ratio of 13 cm2 floor sectors crossed into or out of, to total 13 cm2 floor sectors within an open field apparatus 2025-03-27T15:59:54Z CMO:0004068 PMID:28341233 This is a count of 13 cm2 floor sectors crossed into or out of by an experimental subject, divided by the total number of 13 cm2 floor sectors in an open field apparatus. This measurement may be presented as a fraction, quotient or percentage. clinical_measurement_ontology slaulederkind