Abstract
1. Three types of reflex rebound contractions were studied in the quadriceps muscle of decerebrate cats: rebound following reflex inhibition, rebound after reflex contraction caused by ipsilateral afferent stimulation, and rebound after reflex contraction caused by contralateral afferent stimulation.2. The strength of rebound contractions following reflex inhibition and reflex contraction after ipsilateral sensory stimulation increased with an augmentation of the stretching force previously applied to the muscle.3. These types of rebound contractions could not be produced after complete deafferentation of the muscle. Transection of the sixth posterior lumbar root usually sufficed to abolish rebound; in those cases where rebound persisted, although decreased in force and inconstant, transection of the seventh posterior lumbar root finally abolished it.4. There was no evidence that the fourth and fifth lumbar posterior root participated in the production of quadriceps rebound.5. Reflex rebound, under the conditions studied, is explained as a phenomenon originating in the proprioceptors of the muscle.
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