Decerebrate cats with the spinal cord sectioned at low thoracic levels were subjected to sinusoidal rotations in the vertical plane, while recording the EMG activity of both triceps brachii muscles. The applied stimulus activated utricular and saccular receptors as well as the vertical semicircular canals. Using results presented in preceding papers2,3, namely the dynamic response characteristics of the motor output to macular inputs and the fact that the responses to otolith and canal stimulation summate linearly3, it is deduced that the dynamic characteristics of the motor output in response to stimulation of the vertical canals are the same as those to horizontal canal stimulation. The implication of these findings vis-à-vis the problem of central processing of vestibular inputs and the problem of postural stability is discussed.
Bibliographical noteFunding Information:
This work is part of a research program supported by PHS Grant NSO2567. Computer facilities were made available by Grant AFOSR 71-1969 from the Air Force Office of Scientific Research. Dr. John H. Anderson was supported by NIH Training Grant NSO5494 and Dr. John F. Soechting was the recipient of a Special Postdoctoral Fellowship, No. 1 FI0 NS 2739-01 NSRA from NIH.
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