number of 20 x 20 cm floor squares crossed into, out of, or within a discrete space in an open field apparatus number of 20 x 20 cm floor squares crossed on the periphery of an open field apparatus 2024-08-01T17:47:06Z CMO:0004016 This is a measurement of the horizontal movement within the periphery of an open field apparatus, measured as a count of the 20 x 20 cm floor squares adjacent to the enclosing wall crossed by an experimental subject during an experiment. VT:0001392 VT:0002572 clinical_measurement_ontology jrsjrs open field outer locomotion