01345nas a2200229   4500008004100000022001400041245011800055210006900173260001200242300001400254490000700268520062900275653001900904653001200923653002500935653003500960653001800995653001901013100002101032700001501053856004701068       1988                        eng d  a0013-469400aSpinal stretch reflex and cortical evoked potential amplitudes versus muscle stretch amplitude in the monkey arm.0 aSpinal stretch reflex and cortical evoked potential amplitudes v  c04/1988  a394–3970 v693 aWhile investigating operant conditioning of the primate spinal stretch reflex (SSR), we studied SSR amplitude and cortical somatosensory evoked potential (SEP) amplitude as stretch amplitude changed in the monkey arm. Initial muscle length and background EMG activity remained constant. With change in stretch amplitude (and proportional change in stretch velocity and acceleration), changes in SSR and SEP amplitudes were respectively 0.75 and 0.66 as great. The lesser change in SSR amplitude may reflect saturation of Ia afferents, while that in SEP amplitude may also reflect participation of other peripheral receptors.10amuscle stretch10aprimate10aSomatosensory Cortex10asomatosensory evoked potential10aspinal reflex10astretch reflex1 aWolpaw, Jonathan1 aDowman, R.  uhttp://www.ncbi.nlm.nih.gov/pubmed/245073801145nas a2200229   4500008004100000022001400041245004900055210004800104260001200152300001400164490000800178520053400186653002100720653001900741653001900760653001200779653001800791653001900809100002100828700001900849856004700868       1982                        eng d  a0006-899300aDiurnal rhythm in the spinal stretch reflex.0 aDiurnal rhythm in the spinal stretch reflex  c07/1982  a365–3690 v2443 aWe studied primate spinal stretch reflex (SSR) amplitude as a function of time of day. SSR amplitude was greatest around midnight and smallest around noon. The diurnal rhythm was not simply a function of number of trials, or of the lighting cycle. This rhythm offers an opportunity to study the neuronal and synaptic mechanisms producing a diurnal change in CNS function. Its existence indicates that the CNS response to a given limb disturbance, and thus the CNS activity underlying a given performance, varies with time of day.10acircadian rhythm10adiurnal rhythm10amuscle stretch10aprimate10aspinal reflex10astretch reflex1 aWolpaw, Jonathan1 aSeegal, R., F.  uhttp://www.ncbi.nlm.nih.gov/pubmed/6889452