measurement of voluntary locomotion in an experimental apparatus measurement of voluntary locomotion in an open field apparatus 2024-08-01T18:09:55Z Any measurement of the movement of an organism from one place to another in an open field apparatus when that movement originated and/or was undertaken, controlled, or accomplished as a result of free will or choice. An open field apparatus is an arena, often but not always circular and brightly lit, enclosed in walls of sufficient height to prevent the escape of the experimental subject. CMO:0004020 OF apparatus clinical_measurement_ontology jrsjrs