Effects of interstimulus interval on somatosensory evoked magnetic fields (SEFs): a hypothesis concerning SEF generation at the primary sensorimotor cortex

1996 ◽  
Vol 100 (6) ◽  
pp. 479-487 ◽  
Author(s):  
H. Wikström ◽  
J. Huttunen ◽  
A. Korvenoja ◽  
J. Virtanen ◽  
O. Salonen ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Sensorimotor Cortex ◽  
Interstimulus Interval ◽  
Primary Sensorimotor Cortex ◽  
Somatosensory Evoked Magnetic Fields

Inhibitory effect of intensity and interstimulus interval of conditioning stimuli on somatosensory evoked magnetic fields

2016 ◽  
Vol 44 (4) ◽  
pp. 2104-2113 ◽  
Author(s):  
Hideaki Onishi ◽  
Kazuhiro Sugawara ◽  
Koya Yamashiro ◽  
Daisuke Sato ◽  
Hikari Kirimoto ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Interstimulus Interval ◽  
Inhibitory Effect ◽  
Conditioning Stimuli ◽  
Somatosensory Evoked Magnetic Fields

scholarly journals Frequency-Dependent Changes of Regional Cerebral Blood Flow during Finger Movements

1996 ◽  
Vol 16 (1) ◽  
pp. 23-33 ◽  
Author(s):  
Norihiro Sadato ◽  
Vicente Ibañez ◽  
Marie-Pierre Deiber ◽  
Gregory Campbell ◽  
Marc Leonardo ◽  
...  
Keyword(s):  
Sensorimotor Cortex ◽  
Anterior Cingulate ◽  
Progressive Change ◽  
Positron Emission ◽  
Primary Sensorimotor Cortex ◽  
Neuronal Recruitment ◽  
Simple Movement ◽  
The Right ◽  
Fast Rates ◽  
Significant Activation

To study the effect of the repetition rate of a simple movement on the distribution and magnitude of neuronal recruitment, we measured regional CBF (rCBF) in eight normal volunteers, using positron emission tomography and 15O-labeled water. An auditory-cued, repetitive flexion movement of the right index finger against the thumb was performed at very slow (0.25 and 0.5 Hz), slow (0.75 and 1 Hz), fast (2 and 2.5 Hz), and very fast (3 and 4 Hz) rates. The increase of rCBF during movement relative to the resting condition was calculated for each pair of movement conditions. Left primary sensorimotor cortex showed no significant activation at the very slow rates. There was a rapid rise of rCBF between the slow and the fast rates, but no further increase at the very fast rates. The right cerebellum showed similar changes. Changes in the left primary sensorimotor cortex and the cerebellum likely reflect the effect of the movement rate. The posterior supplementary motor area (SMA) showed its highest activation at the very slow rates but no significant activation at the very fast rates. Changes correlating with those in the SMA were found in the anterior cingulate gyrus, right prefrontal area, and right thalamus. The decreases in CBF may reflect a progressive change in performance from reactive to predictive.

Sign in / Sign up

Export Citation Format

Share Document