01769nas a2200253   4500008004100000022001400041245010600055210006900161260001200230300001400242490000800256520104100264653001701305653001301322653001101335653001501346653001701361653001201378653001801390100002101408700002301429700001601452856004701468       1989                        eng d  a0304-394000aMemory traces in spinal cord produced by H-reflex conditioning: effects of post-tetanic potentiation.0 aMemory traces in spinal cord produced by Hreflex conditioning ef  c08/1989  a113–1190 v1033 aOperant conditioning of the wholly spinal, largely monosynaptic triceps surae H-reflex in monkeys causes changes in lumbosacral spinal cord that persist after removal of supraspinal influence. We evaluated the interaction between post-tetanic potentiation and these memory traces. Animals in which the triceps surae H-reflex in one leg had been increased or decreased by conditioning were deeply anesthetized, and monosynaptic reflexes to L6-S1 dorsal root stimulation were recorded before and after tetanization from both legs for 3 days after thoracic cord transection. Animals remained anesthetized throughout and were sacrificed by overdose. Reflex asymmetries consistent with the effect of H-reflex conditioning were present after transection and persisted through the 3 days of study. Tetanization affected conditioned leg and control leg reflexes similarly. This finding suggests that, while post-tetanic potentiation and probably H-reflex conditioning alter Ia synaptic transmission, the two phenomena have different mechanisms.10aconditioning10aLearning10aMemory10amotoneuron10apotentiation10aprimate10aspinal reflex1 aWolpaw, Jonathan1 aCarp, Jonathan, S.1 aLee, C., L.  uhttp://www.ncbi.nlm.nih.gov/pubmed/277985201361nas a2200229   4500008004100000022001400041245010600055210006900161260001200230300001400242490000700256520067400263653002400937653001200961653001600973653002300989653001801012653001701030100002101047700001601068856004701084       1987                        eng d  a0014-481900aMotoneuron response to dorsal root stimulation in anesthetized monkeys after spinal cord transection.0 aMotoneuron response to dorsal root stimulation in anesthetized m  c10/1987  a428–4330 v683 aIn preparation for studying the spinal cord alterations produced by operant conditioning of spinal reflexes, we studied peripheral nerve responses to supramaximal dorsal root stimulation in the lumbosacral cord of deeply anesthetized monkeys before and after thoracic cord transection. Except for variable depression in the first few minutes, reflex responses were not reduced or otherwise significantly affected by transection in the hour immediately following the lesion or for at least 50 h. The results suggest that reduction in muscle spindle sensitivity and/or in polysynaptic motoneuron excitation contributes to stretch reflex depression after cord transection.10amonosynaptic reflex10aprimate10aSpinal Cord10aspinal cord injury10aspinal reflex10aspinal shock1 aWolpaw, Jonathan1 aLee, C., L.  uhttp://www.ncbi.nlm.nih.gov/pubmed/3480233