measurement of voluntary locomotion into, out of, or within a discrete space in an open field apparatus number of 20 x 20 cm floor squares crossed into, out of, or within a discrete space in an open field apparatus 2024-08-01T17:41:32Z CMO:0004015 This is a measurement of the distance traveled in an open field apparatus, measured as a count of the squares of a 20 cm square grid marked on the floor of the apparatus, crossed by an experimental subject during an experiment. An open field apparatus is a circular or square arena with enclosing walls of sufficient height to prevent the escape of the experimental subject. clinical_measurement_ontology jrsjrs measurement of voluntary locomotion in an open field apparatus