Search Results - "Powers, R K"

Disturbances of motor unit rate modulation are prevalent in muscles of spastic-paretic stroke survivors by Mottram, C J, Heckman, C J, Powers, R K, Rymer, W Z, Suresh, N L

“…Stroke survivors often exhibit abnormally low motor unit firing rates during voluntary muscle activation. Our purpose was to assess the prevalence of…”
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Black box revisited: a technique for estimating postsynaptic potentials in neurons by Türker, K.S., Powers, R.K.

“…Our understanding of the operation of the brain depends on knowledge of its wiring. Currently, the wiring of the human brain is estimated by counting the…”
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Input-output functions of mammalian motoneurons by Powers, R K, Binder, M D

“…Our intent in this review was to consider the relationship between the biophysical properties of motoneurons and the mechanisms by which they transduce the…”
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Estimation of postsynaptic potentials in rat hypoglossal motoneurones: insights for human work by Türker, K S, Powers, R K

“…Classical techniques for estimating postsynaptic potentials in motoneurones include spike-triggered averages of rectified surface and multiunit…”
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Effects of Common Excitatory and Inhibitory Inputs on Motoneuron Synchronization by Turker, K. S, Powers, R. K

“…  1 Department of Physiology, University of Adelaide, SA 5005, Australia; and   2 Department of Physiology and Biophysics, School of Medicine, University of…”
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Effects of Large Excitatory and Inhibitory Inputs on Motoneuron Discharge Rate and Probability by Turker, K. S, Powers, R. K

“…  1 Department of Physiology, University of Adelaide, South Australia 5005, Australia; and   2 Department of Physiology and Biophysics, School of Medicine,…”
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The effects of common input characteristics and discharge rate on synchronization in rat hypoglossal motoneurones by K S Türker, R K Powers

“…Synchronous discharges between a pair of concurrently active motoneurones are thought to arise from the spike-triggering effects of synaptic inputs shared by…”
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Contributions of the input signal and prior activation history to the discharge behaviour of rat motoneurones by Powers, R. K., Dai, Y., Bell, B. M., Percival, D. B., Binder, M. D.

“…The principal computational operation of neurones is the transformation of synaptic inputs into spike train outputs. The probability of spike occurrence in…”
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Spike frequency adaptation studied in hypoglossal motoneurons of the rat by Sawczuk, A, Powers, R K, Binder, M D

“…1. We studied spike frequency adaptation of motoneuron discharge in the rat hypoglossal nucleus using a brain stem slice preparation. The characteristics of…”
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Relationship Between Simulated Common Synaptic Input and Discharge Synchrony in Cat Spinal Motoneurons by Binder, Marc D, Powers, Randall K

“…Department of Physiology and Biophysics, School of Medicine, University of Washington, Seattle, Washington 98195 Binder, Marc D. and Randall K. Powers…”
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Effective synaptic current and motoneuron firing rate modulation by Powers, R K, Binder, M D

“…1. We used a modified voltage-clamp technique to measure the steady-state effective synaptic currents (I(N)) produced by activating four different input…”
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A variable-threshold motoneuron model that incorporates time- and voltage-dependent potassium and calcium conductances by Powers, R K

“…1. A "threshold-crossing" motoneuron model was developed to relate recently described biophysical features of cat alpha-motoneurons to motoneuron discharge…”
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Quantitative relations between hypertonia and stretch reflex threshold in spastic hemiparesis by Powers, R K, Marder-Meyer, J, Rymer, W Z

“…The relative contributions of variations in stretch reflex threshold and total joint stiffness to changes in stretch-evoked torque were assessed in the spastic…”
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Stretch reflex dynamics in spastic elbow flexor muscles by Powers, R K, Campbell, D L, Rymer, W Z

“…Previous studies of stretch reflexes in patients with spastic hypertonia have emphasized the dynamic character of stretch reflex output. In contrast, our own…”
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Experimental evaluation of input-output models of motoneuron discharge by Powers, R K, Binder, M D

“…1. We measured the modulation of the background firing rate of cat spinal motoneurons produced by simulated, repetitive excitatory postsynaptic potentials…”
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Functional identification of the input-output transforms of motoneurones in the rat and cat by Poliakov, Andrew V., Powers, Randall K., Binder, Marc D.

“…1. We studied the responses of rat hypoglossal and cat lumbar motoneurones to a variety of excitatory and inhibitory injected current transients during…”
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Distribution of rubrospinal synaptic input to cat triceps surae motoneurons by Powers, R K, Robinson, F R, Konodi, M A, Binder, M D

“…1. We evoked steady-state synaptic potentials in triceps surae motoneurons of the cat by stimulating the hindlimb projection area of the contralateral…”
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Effects of low-frequency stimulation on the tension-frequency relations of fast-twitch motor units in the cat by Powers, R K, Binder, M D

“…1. Tension-frequency relations were measured in single fast-twitch motor units of the cat flexor digitorum longus (FDL) muscle before and after stimulating…”
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Effects of background noise on the response of rat and cat motoneurones to excitatory current transients by Poliakov, A V, Powers, R K, Sawczuk, A, Binder, M D

“…1. We studied the responses of rat hypoglossal motoneurones to excitatory current transients (ECTs) using a brainstem slice preparation. Steady, repetitive…”
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Summation of motor unit tensions in the tibialis posterior muscle of the cat under isometric and nonisometric conditions by Powers, R K, Binder, M D

“…1. The tension produced by the combined stimulation of two to four single motor units of the cat tibialis posterior muscle was compared with the algebraic sum…”
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