Abstract
Nonlinearities present in the motor output response of biceps and triceps muscles in normal human subjects to applied torque perturbations were evaluated quantitatively. When the applied perturbations were relatively continuous, consisting of a pseudo-random train of pulses, the identified nonlinearities were small, never exceeding 20% of the amplitude of the linear component of the response and usually being much less.
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Barker, H.A., Obidegwu, S.N., Pradisthayon, T.: Performance of antisymmetric pseudorandom signals in the measurement of 2nd-order Volterra kernels by cross-correlation. Proc. IEE 119, 353–362 (1972)
Barker, H.A., Pradisthayon, T.: High-order autocorrelation functions of pseudorandom signals based on m sequences. Proc. IEE 117, 1857–1863 (1970)
Chen, W.J., Poppele, R.E.: Small signal analysis of the response of mammalian muscle spindles with fusimotor stimulation and a comparison with large signal response. J. Neurophysiol. 41, 15–27 (1978)
Dufresne, J.R.: Transient response of the human forearm system about the elbow joint. Ph. D. Thesis, University of Minnesota, Minneapolis, Minnesota 1977
Dufresne, J.R., Soechting, J.F., Terzuolo, C.A.: Electromyographic response to pseudo-random torque disturbances of human forearm position. Neurosci. 3, 1213–1226 (1978)
Dufresne, J.R., Soechting, J.F., Terzuolo, C.A.: Reflex motor output to torque pulses in man. Identification of short and long-latency loops with individual feedback parameters. Neurosci. 4, 1493–1500 (1979)
Ghez, C., Shinoda, Y.: Spinal mechanisms of the functional stretch reflex. Exp. Brain Res. 32, 55–68 (1978)
Hasan, Z., Houk, J.C.: Transition in sensitivity of spindle receptors that occurs when a muscle is stretched more than a fraction of a millimeter. J. Neurophysiol. 38, 673–689 (1975)
Joyce, G.C., Rack, P.M.H., Westbury, D.R.: The mechanical properties of cat soleus muscle during controlled lengthening and shortening movements. J. Physiol. 204, 461–474 (1969)
Krausz, H.K.: Identification of nonlinear systems using random impulse train inputs. Biol. Cybernetics 19, 217–230 (1975)
Marmarelis, P.Z., Naka, K.I.: Identification of multi-input biological systems. IEEE. Trans. Bio-med Engrg. BME 21, 88–101 (1974)
Matthews, P.B.C., Stein, R.B.: The sensitivity of muscle spindle afferents to small sinusoidal changes of length. J. Physiol. 200, 723–749 (1969)
Nichols, T.R., Houk, J.C.: Improvement of linearity and regulation of stiffness that results from actions of stretch reflex. J. Neurophysiol. 39, 119–142 (1976)
Poppele, R.E., Terzuolo, C.A.: Myotatic reflex: its input-output relation. Science 159, 743–745 (1968)
Ream, N.: Nonlinear identification using inverse repeat m sequences. Proc. IEE 117, 213–218 (1970)
Rymer, W.Z., Houk, J.C., Crago, P.E.: The relation between dynamic response and velocity sensitivity for muscle spindle receptors. Proc. Intern. Union Physiol. Sci. 13, 647 (1977)
Terzuolo, C.A., Dufresne, J.R., Soechting, J.F.: Adaptive properties of the myotatic feedback. Prog. Brain Res. (in press, 1979)
Vilis, T., Cooke, J.D.: Modulation of the functional stretch reflex by the segmental reflex pathway. Exp. Brain Res. 25, 247–254 (1976)
Viviani, P., Terzuolo, C.A.: Modeling of a simple motor task in man: intentional arrest of an ongoing movement. Kybernetik 14, 35–62 (1973)
Watanabe, A., Stark, L.: Kernel method for nonlinear analysis: identification of a biological control system. Math. Biosci. 27, 99–108 (1975)
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Soechting, J.F., Dufresne, J.R. An evaluation of nonlinearities in the motor output response to applied torque perturbations in man. Biol. Cybernetics 36, 63–71 (1980). https://doi.org/10.1007/BF00361075
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DOI: https://doi.org/10.1007/BF00361075