Ratecoding of spinal motoneurons with high frequency magnetic stimulation of human motor cortex.
Add to your Conference/Group
Add your comments:
Insert YouTube Videos inside your Slideworld presentation Copy and paste the video URL from YouTube, choose where to insert the video, and press “Submit”. The video will play in your slideshow after sometime.
Enter YouTube video URL
Enter Slide No where you want to insert youtube videos
Post a comment
Post Comment on Twitter
Post Comment on SlideWorld
Subscribe to follow-up comments
SlideWorld will not store your password. SlideWorld will maintain your privacy.
Subscribe to follow-up comments
Slide 1 :
Rate-coding in Spinal Motoneurons with High Frequency Magnetic Stimulation of Human Motor Cortex P. Bawa, B Calancie. Can J Physiol Pharm. 82: 740-748, 2004
Slide 2 :
C.S. Sherrington motoneuron and motor unit R.E. Burke Motor unit properties E. Henneman The size principle Anaesthetised / decerebrate cats
Slide 3 :
Recruitment & Rate Coding in Humans Landmark papers on normal humans, using voluntary cortical input to the motoneurons, was done by Dick Stein and is coworkers in Edmonton. In addition to establishing the size principle of MU recruitment, they also established rate coding and recruitment in the control of movement ( Journal of Physiology, 1973)
Slide 4 :
Transcranial magnetic stimulation Single stimulus pulses applied to a transcranial magnetic stimulator recruit motoneurons according to size principle (Bawa and Lemon, J Physiology, 1993) High frequency trains applied to the motor cortex of baboons showed potentiation of responses of spinal motoneurons Phillips and Porter (1964)
Slide 5 :
METHODS We studied the firing patters of human motoneurons when high frequency stimulus trains were applied to the motor cortex
Slide 6 :
High Frequency Transcranial Magnetic Stimulation of the motor cortex m@n stimulus train Number of pulses in the train, m = 2, 3, 4 Interpulse interval n = 1- 6 ms Four MAGSTIM 200s connected in series by 3 BiStim Modules
Slide 7 :
RESULTS Surface EMG As the number of pulses in the stimulus train increased, area under the response peak increased. Figure on the right shows rectified and averaged surface EMG from tibialis anterior muscle for 1, 2 and 4-pulse trains.
Slide 8 :
Three Pulse Trains
Slide 9 :
Slide 10 :
Double discharges in tibialis anterior
Slide 11 :
Summary of Results A high frequency stimulus train applied to the motor cortex results in facilitation of the motor output During this facilitation, the motoneuron demonstrates rate coding: (2) by responding with double discharges (1) by responding more frequently with single pulses
Slide 12 :
In humans, spinal motoneurons are capable of following the extremely high firing rates associated with corticomotoneurons These extremely high rates or short interspike intervals are important for maximizing the force F and dF/dt at the onset of a contraction Conclusions
Slide 13 :
Genital Human Papill...
POST LUMBAR PUNCTURE...
Predictors of ambula...
Mining Databases to ...
Preventing alcohol a...
Free Powerpoint Templates
5 Years ago.
830 Views, 0 favourite
PowerPoint Presentation on Rate-coding of spinal motoneurons with high frequency magnetic stimulati
PowerPoint Presentation on Rate-coding of spinal motoneurons with high frequency magnetic stimulation of human motor cortex. or PowerPoint Presentation on This powerpoint describes the firing patterns of human motoneurons when the motor cortex is stimulated with high frequency trains.
More By User
Flag as inappropriate
Select your reason for flagging this presentation as inappropriate. If needed, use the
form to let us know more details.
Other Terms Of Service Violation