TY - JOUR T1 - Spinal stretch reflex and cortical evoked potential amplitudes versus muscle stretch amplitude in the monkey arm. JF - Electroencephalography and clinical neurophysiology Y1 - 1988 A1 - Jonathan Wolpaw A1 - Dowman, R. KW - muscle stretch KW - primate KW - Somatosensory Cortex KW - somatosensory evoked potential KW - spinal reflex KW - stretch reflex AB - While 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. VL - 69 UR - http://www.ncbi.nlm.nih.gov/pubmed/2450738 ER -