Skilled interactions with new environments require flexible changes to the transformation from somatosensory signals to motor outputs. Transcortical reflex gains are known to be modulated according to task and environmental dynamics, but the mechanism of this modulation remains unclear. We examined reflex organization in the sensorimotor cortex. Subjects performed point-to-point arm movements i...

Objectives: To investigate the modulation of the soleus H reflex in spinal cord injured (SCI) subjects resulting from imposed changes in hip angle and to establish whether changes in H reflex amplitude co-vary with changes in reflex latency and duration. Methods: H reflexes were recorded using conventional methods in 7 SCI subjects in the supine position. The right leg was secured by a leg brac...

Abstract A subthreshold pulse of transcranial magnetic stimulation (TMS) on the motor cortex can modulate amplitude monosynaptic reflex (H-reflex) elicited in flexor carpi radialis (FCR) muscle, a method known as TMS-conditioning H-reflex. The purpose this study was to establish intersession reliability over course three sessions. Eleven healthy participants received either peripheral nerve (PN...

It is known that somatosensory reflex during voluntary arm movement is modulated anticipatorily according to given tasks or environments. However, when and how reflex amplitude is set remains controversial. Is the reflex modulation completed preparatorily before movement execution or does it vary with the movement? Is the reflex amplitude coded in a temporal manner or in a spatial (or state-dep...

mechanoreceptors of foot sole likely contribute in the reflex regulations. stimulation of these receptors in the lateral aspect of the foot is corresponded to the lateral plantar division of the tibial nerve. therefore, it was hypothesized that repetitive low threshold afferents stimulation would have an inhibitory effect on the soleus h-reflexes. methods: sixteen normal subjects voluntarily pa...

The plantar grasp reflex is of great clinical significance, especially in terms of the detection of spasticity. The palmar grasp reflex also has diagnostic significance. This grasp reflex of the hands and feet is mediated by a spinal reflex mechanism, which appears to be under the regulatory control of nonprimary motor areas through the spinal interneurons. This reflex in human infants can be r...

Recent studies indicate that rats can increase or decrease H-reflex amplitude in response to an operant conditioning paradigm. In addition, rats also display a circadian rhythm in H-reflex amplitude. As part of the development of H-reflex conditioning in the rat as a new model for defining the plasticity underlying a simple form of learning, this study examined the relationship in the rat betwe...