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• W2014898211 abstract "Cat spinal Renshaw cells were activated by stimulating muscle nerves or ventral roots with random (pseudo-Poisson) patterns of brief electrical stimuli. This input pattern is optimal for a comparative study in both the frequency- and time-domain. The frequency-dependent variable of particular interest in this study was the coherence as a measure of the degree to which signal transmission is linear and noise-free; it was estimated via spectral analysis. Time-domain analysis consisted of calculating peri-stimulus time histograms in order to estimate the amount of nonlinearity in the cell responses to pairs of stimuli. The main result was that the amount of nonlinearity measured in this way did not profoundly depress the coherence. Two types of peri-stimulus time histogram were calculated: the “conventional” peri-stimulus time histogram (as a reference) computed with respect to all the stimuli in a train, and the “conditional” peri-stimulus time histogram computed with respect to the second in pairs of stimuli which were separated from each other by varied intervals δ. The latter type of peri-stimulus time histogram showed that Renshaw cell responses to stimuli were conditioned by preceding stimuli, which could facilitate (at small δs) and/or more often depress (up to several hundreds of milliseconds) the subsequent responses in a nonlinear manner. The objective of this study was to test the hypothesis that nonlinear characteristics contribute significantly to depress the coherence from its optimal value (1). Since qualitatively both the coherence and the amount of nonlinearity (facilitation/depression) had been seen to depend on the average excitatory Renshaw cell response to the stimuli, variation of this response (by stimulating different nerves or the same nerve at different rates) was used to check for an inverse correlation between coherence and nonlinearity. Surprisingly, such an inverse correlation was not found. Indeed, the coherence showed a nonlinear, though noisy, positive relationship to the average Renshaw cell response. The amount of facilitation/depression showed a strong linear positive correlation with the average Renshaw cell response. However, the coherence also showed a positive (if any) correlation with the amount of facilitation/ depression. The lack of an inverse correlation between nonlinearity and coherence is at variance with the hypothesis that the latter variable is a significant factor in determining the coherence. Thus, although nonlinearities are present in Renshaw cell responses to random stimuli, the coherence is primarily determined by other factors, in particular by the strength of response and the precise pattern of discharge. This pattern may be of importance in the fine control of motoneuronal discharge during constant muscle contractions." @default.
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• W2014898211 date "1989-01-01" @default.
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• W2014898211 title "The relationship between coherence and nonlinear characteristics in Renshaw cell responses to random motor axon stimulation" @default.
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• W2014898211 doi "https://doi.org/10.1016/0306-4522(89)90009-2" @default.
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