measurement of voluntary immobility number of periods of voluntary immobility 2012-08-27T10:28:46Z A count of the number of discrete intervals during which an organism or experimental subject is 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. CMO:0001045 VT:0001392 clinical_measurement_ontology jsmith number of periods frozen number of periods of freeze behavior number of periods of freezing behavior