number of lines crossed in the center of an open field apparatus number of lines crossed in the seven-section, 50 cm diameter center of a circular open field apparatus 2025-06-23T16:58:39Z CMO:0004098 This is a measurement of the distance traveled within the region in the center of a circular open field apparatus, measured as a count of the grid lines, marked on the floor of the apparatus, crossed by an experimental subject during an experiment. The diameter of the whole apparatus is 82 cm, which is divided into 19 sections. VT:0001392 VT:0010716 clinical_measurement_ontology number of lines crossed in the 50 cm diameter center of a circular, 82 cm diameter open field apparatus slaulederkind