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Updated: Jul 6, 2026

Measuring Active and Passive Tameness Separately in Mice
Published on: August 10, 2018
Tonic immobility: differences in susceptibility of experimental and normal sheep and goats
Abstract:
Tonic immobility ("animal hypnosis" or catatonic trance) could not be induced in 1-year-old foster lambs and kids. Control animals, conforming to a characteristic of their species, could be readily immobilized. The suggested explanation for this difference in behavior is that the foster animals did not develop a normal flight distance because of the ambivalent behavior of the "stepmother," who alternately permitted and refused nursing.
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