measurement of voluntary immobility percent of time spent in voluntary immobility 2012-08-27T10:28:27Z CMO:0001044 Calculated measurement of the relative amount of experiment time that an organism or experimental subject spends frozen, that is, not moving from one place or position to another, when such behavior originated with or was undertaken, controlled, or accomplished as a result of that organism's free will or choice, expressed as a percentage. clinical_measurement_ontology jsmith percent of time spent frozen percent of time spent in freeze behavior percent of time spent in freezing behavior