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Depth‐duration profile of the immobility reflex: Theoretical implications for its triggering, sustaining, and terminating mechanisms

Immobility reflex (IR) durations of rabbits were remarkably consistent (weighted average range of 0.36–0.70 minutes/trial), under the special conditions when rabbits were “habituated” by approximately 25 preliminary trials and when termination of IR was operationally defined as the point at which any attempt, even abortive, at righting occurred. When the mean duration for each rabbit was normalized (into quartile duration points) and then rabbits were tested at these points to determine arousal threshold, each rabbit revealed a clear progressive decrease in the “depth” of IR as the duration of a given episode progressed.