Search PubMed⌕ Search

SEARCH · Search PubMed

Results for “Neural Conduction”

Search indexed PubMed citations on genomics, clinical trials, systematic reviews and public health. Explore titles, authors and supplied subject terms, then open the PubMed record.

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

At least 1,081 records · Page 60Linked to original sources
PubMed1992

Magnetic coil stimulation of the spinal cord in the dog. Effect of removal of bony structure on eddy current.

Magnetic coil stimulation applied to the spine excites the lumbosacral roots rather than the spinal cord itself. To evaluate the mechanism responsible for this phenomenon, the effects of volume conduction on the activation of neural elements were studied. In ten intact dogs compound muscle action potentials could be recorded in the soleus muscle only when the magnetic coil was placed over the cauda equina. After laminectomy and pediculotomy, compound muscle action potentials also could be elicited when the magnetic coil was placed over the spinal cord. These findings suggest that the bony structure surrounding the spinal cord interferes with the spread of magnetically induced eddy currents to the spinal cord.

Action Potentials↗
PubMed1997

Neuronal activity in monkey superior colliculus related to the initiation of saccadic eye movements.

The introduction of a temporal gap between the disappearance of an initially fixated target and the appearance of an eccentric saccadic target results in a general reduction of saccadic reaction times (SRTs)-the gap effect-and often in the production of express saccades, the latencies of which approach the conduction time of the shortest neural pathways from the retina to the eye muscles. We investigated saccade initiation by recording neuronal activity in the superior colliculus in monkeys performing the gap paradigm. Fixation-related neurons reduced their discharge rate during the gap period, regardless of the SRT. This reduction in activity is consistent with the hypothesized release of ocular fixation that facilitates premotor processes and may contribute to the gap effect. In addition to saccade-related discharges, many saccade-related neurons displayed phasic target-related responses and/or low-frequency preparatory activity during the gap period. The level of this preparatory activity correlated with both SRT and express saccade occurrence when the saccade was made into the response field of the neuron. Evidence indicates that advanced motor preparation is required for express saccade generation, which may be subserved by specific increases in the preparatory activity of saccade-related neurons. Increased preparatory activity may allow the target-related responses to trigger short-latency express saccades directly. This study provides insights into the functional mechanism of saccade initiation and may be relevant to the generation of all voluntary motor responses.

Animals↗