amount of experiment time spent in a discrete space in an experimental apparatus ratio of time spent in center to total test time in open field apparatus 2025-03-27T14:57:51Z CMO:0004067 PMID:28341233 This is the amount of time an experimental subject spends in the center of an open field apparatus divided by the total amount of time spent by the experimental subject in the open field appartatus. This measurement may be presented as a fraction, quotient or percentage. VT:0010471 VT:0010716 clinical_measurement_ontology percentage of experiment time spent in center of OF apparatus ratio of time spent in center to total test time in OF apparatus slaulederkind